It is a band-aid solution.
At first you’ll think it’s adding variety because different team comps will show up.
However, flow-charty metas will develop and you’ll be yelled at for experimenting even more than before.
Trying to confuse players into having diverse play styles doesn’t work in the long run. But that is the story of Overwatch: Throw new things into the game hoping to distract players until they exploit said things for the simplistic additions that they really are.
Overwatch would ideally be balanced around high skill ceilings. The meta would be less intrusive in this way, since hero picks and counterpicks would be decided by how adept individual players are at particular heroes. This is how balanced fighting games thrive.