How has every other major MMO solved the problem of downtime other than FF14?

[Remolia]

When I played WoW, I used to joke that they installed patches on all the servers from stacks of 1.44 MB floppy disks. Yes, they had significant downtime too.

But does not FFXIV use old outdated hardware from late 2000s? no? Someone told about it during EU datacenter split in half, coz old Pentium 4 was not able to handle it, and now they want to move into cloud, coz old hardware is way to expensive in order of electricity bills.