To many variables. Nobody is going to depend on a center to do most of their perimeter defense or even anchor it like they do paint defense and protecting the rim. Completely depends on the team, the system and the level of talent they have. I would guarantee nobody signs a center and the first they think is..."how well is his perimeter defense". Again, not saying it's not valuable.
Nobody is asking a center to do “most of their perimeter defense” or “anchor” your perimeter defense
But yea it’s a very important skill in todays NBA. For what the Suns/Heat do switch everything it’s very important like you said depends on the team and you adjust your systems to fit the talent you have.