I'm an aspiring dev when it comes to Visual Novels. I'm currently working on my first one, I've been reading threads like these for research while working on mine. To an extent I can see that constantly seeing the same assets could be kind of annoying. Try to look at in from the Developer side. Let's say you are a great story tell but that's it you can't design you can't draw or anything so of course you shop around for assets to use to tell your story. Like many people here said is that some times there just isn't a whole lot of options to choice from when creating a scene so you have no choice but to pick the same food / supermarket that everyone uses because that's really all there is.
Now for myself, I've already purchased many assets to create the visual of my story. However there are things I need that I simply can't find or just don't like thus I'm pushing back my own production & work to learn new software such as Blender thus I'll be able to make my own assets for things I need and simply can't find in assets. For example one of my scenes require a buss but all I can find are like "City Buses" (Local Transport) or a very old bus. Neither of these options work for my story it just doesn't fit. So instead of trying to change my story to fit assets I'm working on learning another program. Thankfully I already have some 3D Design from Fusion360 that I use for work but it's still a learning curve none the less. Doing something like I'm done now pushing back production and makes it take longer for updates of course because I have to learn and then create assets to use in my story. You also need to purchase assets for textures for buildings, roads, lamps, doors, etc so it's a ton of work and sometimes if you can make an already made asset work that has everything, yeah most people will just opt to buy something already made that works. This helps speeds along development specially if you are really enjoying the story.
I feel like most people here are Indie so we don't have teams of people we are working with to help push out content is just 1 person who's doing everything story telling, coding, design, etc. It's a lot of work to be doing all by yourself and using assets already made helps use developers a whole lot. I've read a lot of VN before making my own so I have a good understanding of things how they made, what they use etc. The re-used assets really don't bother me personally as long as the story is good I could careless about the assets really. I understand how it is and maybe it's because I'm in the same boat but yeah. Like I said try looking at it form our perspective.