It really does depend on what you mean with "lower detailed animations" and I need more detail about it... Is it 3D is it 2D? I personally am all good with stills if they look really good, but I would absolutely like an animation, assuming it looks great, smooth and is looped nicely. I hate the frame by frame thing some people do, where they go through like five frames of sex back and forth, it looks hideous. I understand the why, but I don't like it.
Now... it's quality over quantity always, so just go with what will maintain quality and won't kill your artist lol. A smooth animation is hard to do, that's why people freak out when they see a smooth one. But a good looking still is still (heh) something to praise.
If the artstyle is good, then you absolutely can get away with having only stills, that's completely okay. A lot of games here that are actually good only have stills. It's not just about being fancy, the visual style can make wonders!
Look at this game.
Insexual Awakening. The art is simple enough, the animations are nice but not like the smoothest things in the world. The game has a charm to its style and it's one of my favorites. It's not extremely high detailed or anything, but it's pleasant to the eyes and colorful. It works without being super fancy.
There's a sequel I think... but it's lacking that style and even I am so annoyed by it. The charm is gone! That's why artstyle is more important.