So that more researchers have access. Afaik access is shared and researchers have to make a proposal and get it approved before use, which to me suggests some kind of queue

Queueing researchers should be fine given the universe will be around for a while.

Next time you have to wait for your code to compile we'll say "should be fine, computers will be around for a while".

In 10 years we can send a bigger, simpler, cheaper, one-piece, non-foldable telescope in Starship for a fraction of the cost. The biggest saving wouldn't even be the launch costs - it would be the simple design allowed by relaxing the volume and mass constraints.

If only most of the cost was folding it (and if only Elon Musk's solutions somehow changed all the problems to fit them).

To get twice the science done, of course.

Redundancy would be good reason.