while I still use ohmyzsh, a lot of it’s opponents make it’s slowness one of its complaints. You don’t need ohmyzsh to have fancy things, it’s just makes setting it all up a little easier.
Since version 4.0 the version numbers have nothing to do with changes and are strictly time based. Linux 5.0 happened after Linux 4.20 because Linus “ran out of hands and toes to count on”, same thing with 6.0 after 5.19