It is true that she is somewhat lacking in the romance department, so I get why some users would prefer to see additions there over just purely sexual options. I think we are supposed to count Stan in this category too, though part of the appeal with him to many players is the degradation aspect I think, "Lena getting with the fatty," to be blunt so therefore his route lends itself less well to romance.
The only real issue there is that any romances introduced at this point would probably end up feeling rushed, with the assumption that we are in the game's final stretch now. Unless Eva decided to rework them into the story with retroactive content. Fuckboys can always be introduced randomly, no one expects them to have emotional impact on Lena.
Sure, he is sort of on the extreme end where almost all his routes have optional romantic themes you can pick. I'm guessing that's why quite a few people are so eager to get him with Ivy too, that she seems uncomplicated when it comes to romantic potential.
Yes, I think in general Eva tends to not allow us to just be super casual. Even a cameo like Jack who could have been entirely a one-off option gets the "relationship" treatment where you can optionally keep open the possibility of seeing him again or even dating him potentially in the future. It'd be nice with some sexually nonchalant characters too who don't need a whole wind-down section after battering up Lena's insides, discussing the future with her. Lets us meet some people who just leaves Lena mind-blown and well-fucked in the bathroom stall without all the chit-chat!
We see it with John too where we're told Lena is going on a date with him, but then we don't see the date and go on to just have a generic sex scene with him. I feel like he's designed the wrong way, when Lena tells us she considers some fool a "dating option" we should see the date and get to decide if he's interesting enough to bang then. Otherwise just let us be wholly casual and call him up just because Lena's holes are full of slutty need and she needs someone to scrape them clean...
I don't even recall if John is added to the agenda for Lena. I would like Eva to feature a few characters with Lena and Ian both that don't get pages there and are just clear sexual options.