I don’t think there’s any risk of Geeseki moving away from the minimalist art-style.
Regarding new stuff, there have been several cycles of completing old stuff, then making buggy new stuff without art, then filling in some art for old scenes…
2023 is, according to the public plan, dedicated to forcibly progressing story at the expense of everything else, until the main story is complete. The benefit is frequent new content. The MC even returned to the sex world in the most recent update. There’s also complete Principal Lashley and Hitomi routes, and a short SisterxMotherxMC route. (Mostly just the MC noticing the SisxMom scenes.)
The downside is, that art is taking a back-seat for this entire year. New content is partially sketches, partially nothing at all. I predict that much of 2024 will be required to fill in all the art. The Lashley and MomxSis routes have complete art. Hitomi has half of the art, maybe.