It does not, necessarily - if anyone's using PAK files on a big-endian platform (older Macs, I think ARM is big-endian, too), they will lose their worlds with such a change.
PAK is actually the default now (if you don't set [Storage].Schema or set it to "Default", PAK is used)
PAK is actually the default now (if you don't set [Storage].Schema or set it to "Default", PAK is used)