Who said "needs to be stopped at all costs?"It's not that I don't agree - obviously, I don't agree that a solution to an undeniable & long-standing problem isn't needed - it's just that there's a lot of room between "not needed" and "must be stopped at all costs."
Because, let's face it, there's a lot of wiggle room in the nominal balance of class designs, so even if the fighter were to get a load of non-combat enhancements, what would it hurt?
Say you gave the Fighter Expertise, for instance, would that really make the Bard and Rogue less viable classes?
The fighter can get the benefit of expertise by spending one of their bonus feats. Flexibility is one of the benefits of 5E.
You want to give fighters another bonus feat, perhaps a specific feat? Feel free, I won't stop you.
I simply don't think it's necessary because it hasn't been an issue in any edition. It's even less of one in 5E.
I only posted today because I'm baffled/surprised that people think the fighter has been broken basically since the inception of the class.