I really don't know how all of the Being a DIK style 3dcg RenPy games are so popular on this site to be honest. 95% of them are such complete wastes of time. Maybe I'm in the minority but Id rather play random RPGmaker games. I feel like there is at least a higher chance of finding something good with them than there is with most of the 3dcg RenPy stuff. I swear half of them all use the same set of character models as well.
Tbf, Koikatsu character models (such as in LiL) are at least as repetitive as Daz3D models.
In my personal opinion, I don't see a correlation between different game engines and the quality of a game. Whether a dev uses Daz3D models, Koikatsu, Honey Select, AICG, photo-tracing or hand-drawn graphics will just impact the personal visual taste of the player. There's enough good titles using either of those styles. Some of my favorite games are text only even.
The fact that so many popular games are using Daz3D models is probably because it is easier to use/edit existing models than having to create images from scratch (e.g. hand-drawn). I wouldn't even say that there is a lot less Koikatsku or HS games out there though, which are comparable in terms of effort used in character creation. AICG is also not too difficult to use, at least if doesn't have to be perfect, the high quality ones need a lot of work too though (a lot of touching up).
I also find it funny that you bring up the RPGM engine and highlight it positively. This is by far the most archaic engine still in use, probably because the sex game dev slaves in Japan keep pumping out low effort slop in that engine to this day, somehow keeping it relevant.
Tl;dr: You can't derive the quality of a game by the engine or the character creation software used (unless it's very sloppy AICG, I guess) and need to look at them individually.
