The whole "dimension resets" is kinda a mixed bag.
On one hand, as it was explained to me, each person needs their own copy of the dimension in multiplayer in order for the placement of the puzzles to be sensible. (No, I haven't even begun to progress far enough to understand that).
Second, you need more copies of the puzzles because apparently you have to be able to raid the structures multiple times for spare parts.
But at the same time, it's an absolutely lovely place to set up a base. Or just explore.
It's like ... you'd want one single shared instance with no structures that could be used as a big endgame base, perhaps that you could only get to with a ritual from all 16 cores. That each person could go to, and share, that would not reset. And, on that of that, each person would have their own personal, non-sharable puzzle dimension.
But if you can't reset the puzzle dimensions, you run into things like a color blind, or deafness problem. Or perhaps there's another issue with another puzzle.
Not to mention that if it never clears out, you'll have a lot of wasted disk space eventually, with all the exploring/travel needed out there.