Consider that in this Dark Fantasy world in which both are trap as hostages and put to work for their enemies, they are visiting a gynecologist to have their baby (something that even Nasim doesn't seem to be really exited with the idea to involve Chaos Magic in the process, something that i will enjoy a lot in the future). Would you consider your girlfriend or wife NTR you when she tells you she need a date to the gynecologist?. If the answer is yes, then probably you have seen too much JAV movies about gynecologist helping wifes to be breed pal, i'm sorry.
Well, everyone has noted this for a long time ago, there are annoying events with Andrass involved early that need strength or a high diplomacy, if Rowan isn't successful, he or Alexia pay the consequences (and many times in a sexual way that as a player never intended in the first place). Over the map i do not care too much personally, but sometimes get annoying but is more sad when this event relies only in pure dice luck (randomize) when they could added some actual battles to some orc savages, thieves, animals and monsters, to add more dynamic and bestiary that could built more the world itself, but they preferred to adhere to be as most VN textual as possible, giving some dynamic by random possibilities in which Rowan will be successful or not. Many complaint here in the past of why Alexia has so many decisions that at the end will not change the dynamic of how Rowan works, well that must be because it will become more important in the future, given the state of their relationship a key role, but perhaps Rowan could rely into others by building relationships and deals with others, but in essence, the feeling of reward those Alexia Corruption Events could be an obstacle for the player as Rowan's Companion could in essence betray him in the future, it's like ruining your own playthrough by passing from hard to suicidal mode (but her porn is good).
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I'll tell this, normally Dark Fantasy settings invites you to give in into your more inner deeper savage dark desires, doing so usually give short rewards with a high demand in the future, is not usual that this setting have happy endings with ppl with their hands taken chanting kumbaya, that will not happen, and every near "good" ending will never be complete satisfactory, the path for that is hard with lil rewards and painful in the end. If you have pay attention, this game, whatever the path you take seems it will not end well, a famine is beginning and the reason is not only by the war Da Twins began but by the abuse of magic that it's draining the life of the world itself, so even if Rowan and Alexia are virtuous and righteous as possible at the end of this whole saga of three games, it will not be complete satisfactory and you would end anyway taking bad decisions because Da Twins will not giving you more choices than that which will making you a bitter victory for the "good" side (if there's a "good" side because this is still a Dark Fantasy setting, being evil or good it doesn't mean that high powers that could manifest later will comply or be in alignment in what Rowan and Alexia could consider "good" or even you as a player consider "good").
Regarding events that doesn't trigger, it depends about your luck and the corruption the character have, the thing is the game have so many events that are mainly random, that the time given to make them appear have become short, as you stated some are random while visiting the towns, but others are inside Bloodmeed that only activates every week, and there are events that are bugged to the point to break all old savefiles or still need a rewrite or a change in art, we all hope for the best they fix them as most as possible to enjoy them. If you want a more Corrupted Rowan, steal every time you have the chance, cheat Alexia as there's no tomorrow, confess to her your love for Helayna, corrupt your wife by having a threesome with X'zaralt and later with Liurial, kill your mentor, fuck everything (alright, if your not into gay things, then fuck everything that looks as female, orcs, elves, dryads, including X'zaralt and specially the female driders), corrupt, seduce, enslave and kill if you have the opportunity, laugh as a madman during the preparations for Rastedel.
Well, as i said, never expect a sense of hope nor triumph in a Dark Fantasy setting, what you can expect is for the worst, or a conclusion apparently "good" but that comes with a great pain anyway that feels still like losing. As SoC is intended, the paths are there but they are not very clear sometimes, and there will be events no matter you as a player can do will not have a satisfactory resolution as Rastedel is, with lil preparations, few allies, a lot of pressure because of a high demanding bosses and miscalculation. The same is with Tue-San, yes, she wants her sister killed, so?, what you must understand is that there are ppl who have their own interest and agenda, and if you put in danger that or betray them after having an agreement with them or evolving feelings with them, they will not by any chance getting in a good way nor will be in disposition to be with you as they could in the beginning because you ruined the relation, you can't have all in life, in Dark Fantasy settings this is like the bread of every day, more common and likely results of your actions (like in the real world but in this setting you must expect to be more pessimistic).