qwerty222999 on 16. Mar. 2017.
Finding perfect balance is a nigh impossible task. But thankfully some companies find ways to use that to their advantage, with metas. Just like the tank meta, Overwatch could benefit from big balance changes every now and then (such as once or twice every year) to throw the meta around. Not stuff like the recent Ana nerf that only focused on bringing a single hero down, but adjustments to EVERYONE, and minor adjustments as well, as a slight buff here and a slight nerf there does a lot to the shape of the game, and determines which meta the game is going to become. It's intuitive and refreshing.
How often a meta should happen is hard to plan out without testing first. For Dota 2 for instance, they do it every year, and fine tunes the meta change just 2-3 months after release if necessary, then let's their big tournament The International play out, where after they do a meta update again.
Overwatch could do the same, but again the right time to change meta, is hard to say. I'll leave