Sometimes the hardware or the software you run requires exact versions of the packages with some specific behavior to work correctly. These include drivers' parts on both kernel and userland, some specific application which requires a very specific version of a library, so on and so forth.

I for one, can use Alma for 99% of the time instead of the old CentOS, but it's not always possible, if you're running cutting edge datacenter hardware. And when you run that hardware as a research center, this small distinction cuts a lot deeper.

Otherwise, taking the LEAPP and migrating to Alma or Rocky for that matter is a no-brainer for an experienced groups of admins. But, when computer says no, there's no arguing in that.