can I assume these files are reused

A definite maybe, they may or may not be used, but we'd like to keep that option 🙃

Maybe the "old" way Dataset were shown is better suited ?

It was, but then it's gone now 😞

I see your point, this actually might be a "bug"?!

I would say so myself, but could be also by design..?

Awesome, I'll ask Product to reach out

LMK, happy to help out!
I know our use case is maybe a very different one, but generalizing from it would surely be beneficial 🙂