It kinda just goes back to them not being worth the time needed to make them.
The first animations of the kids fucking the female student were quite good but took WAY too long. Not worth it.
Sam's bedroom animations were better in that ratio of quality:time.
These aren't. The tits look way different, even the characters look look like fan art in how they're slightly "off".
If you want to lower the quality to speed up the time, great! Just do it for everything. I've said for a while that I think most fans would take a step backward in quality for faster development. Just do that or cut the animations.