They should give it a few months after release. Then the first balance patch should be fixing all the bugs/glitches of course, but then slightly buffing all the characters that are perceived at the time to be bottom tier. Nothing crazy yet, just giving them slight boosts. And as long as none of the top tiers have anything game breaking, leave them alone for the time being. You can do very slight tweaks to the top 3-5 or so, but only super minor stuff.
Then a few months from that, aka 6 months from release, they do a big balance patch. This will also be fixing any of the bugs/glitches, but then super buffing the bottom tier, and minor buffs to the mid tier. Again, if the top tier at this point don’t have anything game breaking, definitely leave them alone at this point.
This allows every character to be somewhat viable, and doesn’t force people who have been maining certain top tier characters to have to abandon their characters. While simultaneously rewarding those who stuck with the lower tiered characters.
And I’d repeat this process. Where in 3 months after this, have the slight buffs to the bottom, and very very minor tweaks/nerfs to the top 3-5 or so. Then in 3 months after that, another large balance patch where you’d again super buff bottom, slightly buff mid, and probably leave the top alone aside from super game breaking stuff, just like before. So just repeating the process. Every 6 months huge balance patch where bottom gets big buffs and mid get mid buffs, and every 3 months just minor tweaks like slight buffs to bottom, slight nerfs to top. Repeat.
This would be the balancing philosophy I’d at least try and see how it worked out. Doubt we’ll ever actually see something like this, but it’d definitely be something I’d want to see.