About a week ago, a bunch of new tasks were added to the dev log. Won’t bother with a break-down, but it mostly seem to be about new main story content. Stand out feature is that Edward’s tapes are included. They might be the first actual sex-world content in literal years, possibly.
It's been a few years since I played this: Is it better now? I had a real issue with scenes not being included (instead just being described) or the constant bugs.
Most of the "temporary" assets you remember were probably completed and added in at some point. I’m intentionally writing this as two separate things, because last time I checked there were several items which were completed years ago but never actually added. (Sexworld!Threegans dialogue at the mall was written in the script, but in the game it still said that it was not yet implemented. MomxSis route has ~3 pictures which were completed close to a year ago, according to the dev- and changelogs, but they are still not in the game. Some more I cannot recall yet.)
Of course there are
new temporary assets now. Most new content is implemented with at least some sketches first, then completed over then next few updates.
Actually,
Rutonat is probably the best to ask about when incomplete art assets start appearing since they played the game most recently.