Hmm, judging by this, you do not know the language of the game well and therefore you are only interested in images and animations in the game, and not the content of the game itself. The difference between RPGMV(Z) and Ren'Py engines is that the former is a game engine, while the latter mainly serves to scroll through comics in slideshow mode.
Maybe you are the one who doesn't know how the engine works? I'm not here to defend the game, I love it rpgm and ren'py more.
But do you know that there are people who have made ren'py a lot like a RPGM game? Monster Girl Dreams? It has the RPGM combat but not the useless running. This game with Amazon Lauren by winterwolves same thing but different combat. and so many more games does things in ren'py than just a comic slideshow.
Look up those games if you don't believe me.
The real issue is that the main game has too much useless running and it feels somewhat weird? Like who am I to talk to? what? The damn school? I ran everywhere but outside.
RPGM has really cool stuff I agree, If it's done right. Even then a good ren'py would probably outshine it if you look at the examples I gave you.
A lot is a bout how you do things. But ren'py so far seems to have a lot more going for it when it comes to an engine. Not just a porn game engine or comic slide show. It seems like you can do some seriously cool shit.
Also what's wrong with wanting some hot scenes in a slideshow when it's a game without combat? Just saying. Where is the real good RPGM elements? Running? What else?