"It seems like you are running a 32-bit PHP version. Nextcloud needs 64-bit to run well. Please upgrade your OS and PHP to 64-bit!

It looks like Cannot access files after upgrade to Nextcloud 25 is fixed.

But what does is mean “Nextcloud needs 64-bit to run well”?
Which is the depency on this architecure?
I really don’t want to set up my Raspi from scratch and reinstall all the applications.
What will happen if i stay with 32-bit?
NC worked well on 32-bit up to now. What changed with NC v25?