Hmmm.
Then let me ask a question of everyone who keeps repeating: "Just be a better GM and challenge only the Soak Monkey".
I’m not saying that. I’m saying that if you’ve got a Soak Monkey, then they are there for a reason and they expect to have to tank a lot of damage, and if you do want to challenge them then one way to do that is to give them opponents who will focus on them and send a lot of damage their way. But that’s not the only way.
Do you do this with other characters? Do you go out of your way to make Social encounters harder only for the Face? Is it harder to fix things only when the Mechanical Wizard is in the scene? Do things become easier for the other characters who aren't specced for those duties?
When the GM is figuring out how hard some roll is going to be, certainly one of the things they should consider is how good the character is at doing these kinds of things. That’s not the only factor, but it should be considered.
Now answer this: If you don't make it easier (IE it's either a static check or you've tailored the numbers for the Best Guy to be doing it), how often does a failed Social encounter end in TPN (Total Party Naptime)? Or a failed Mechanics check? Or a failed Knowledge check?
Failed checks are actually when the fun really begins. You get to try to figure out what the fallout might be, and how that could potentially be resolved. The GM and the players are supposed to be working together to help tell an interesting and fun story, and situations where everyone is completely successful all the time aren’t very interesting.
In our game, all of our best and most interesting moments have come when someone flubbed a roll and then we had to figure out what came next.