Ahhhh, The $64 Question! (Used to be an old TV Game show...)neogeo wrote: Sun Jul 16, 2023 1:06 am One stupid question:
- Can I smoothly online upgrade from my 21.3 to 23.x (when stable arrives)?

A lot depends on the 'state' of the Linux Kernel (currently: 6.x). Many versions, but only a few are put into 'long term support'. If you want -- have a look: Linux kernel version history. (Note: first table has a sliding bar at the bottom, you can go way out to the right. Also, the table for 5.x.y gives you a good picture of how it works.)
For MX 19 the upgrade was fairly simple, but for MX21, where we went from the 5.10 to the 6.1 Kernel, we needed to have a completely new Install. As for MX23, I'm guessing that since we are still early on 6.x, it will be 'easy'? But, what do I know? It's up to the experts; They know! Time will tell.
(And, of course, MX 21 will continue to be supported for about two years after the move to MX 23; so not to worry!)