Renpy interface is quite obnoxious for non-visual novel games, also mouse-based interaction is annoying and makes repetitive tasks even more of a chore. One of my main gripes with the game is how bloody long it takes to do anything, and how grindy certain tasks end up being (like the insufferable grind to get money for the feast) constantly having to revisit areas checking for changes with each update is also really annoying (do I go talk to Kira now? No, there was a scene somewhere else first. OK now? Nope, that opened up a scene elsewhere you need to do before that, etc. etc.)
For UI its identical to RPGM box buttons. Renpy allows you to customise the UI far more, the devs just aren't using it.
As for grind, you can bind ctrl to your any mouse button for easy skipping, get used to high sens for fast clicking all over the screen, the load times are virtually non-existent in Renpy as where RPGM is like DOS, which is fine in looks not so much in performance, replaying a game in RPGM especially is torture
In regards to the game play grind you described nothing thats exclusive to Renpy it would be the same in any other engine both have save editors to reduce grind but console commands in Renpy allow you to manipluate varaibles in real time which is a huge bonus if you hate grind as I do
I would also have greatly preferred a general narrative of a dominant Sabia using sex as a means to an end and using the desires of those around her against them, but playing the dominant route now is mostly just going around and just occasionally, almost randomly, having sex with something that came up, which ends up feeling jarring as it's a normally "dominant" Sabia just ends up going out to get fucked by something (Kia/tentacles etc.) with the only exception being Lutvog
Can't argue with you here, the decisions only matter in sex scenes and the totally of the difference is a few pictures and sentences of dialogue, the sub/dom paths aren't paths just scene variants