Inconceivable, You think people preferred RPGM to Renpy? the only complaints about Renpy I've read is that they blamed a lot of the delays on figuring out python coding needed for it, not against the engine itself
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.)
I'm also not much of a fan of the way Sabia exists in the story, the fact that she can be a completely different person based on a few choices just means every route is watered down to allow a multitude of options and Sabia herself just ends up feeling like an afterthought in her own story. The narrative being all over the place is further reinforced by the fact that they felt they had to change the opening, and Sabia refusing to go to the tents after the first chapter feels like a bait-and-switch with what the initial released actually offered. This recurs throughout, and leads to a lot of disappointing situations (working in the bar, getting harassed... SURPRISE SUDDENLY MURDER, apparently Sabia set this whole thing up off screen without any player agency)
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.