Not so Mundane
One of the greatest books (in my opinion) to come out of 3.5 was the Tome of Battle (aka the Book of Nine Swords). In essence, it destroyed the idea that martial classes should be perfectly mundane, and put them solidly in line with the spell casters of similar level. If you were from one of the classes in the ToB, you were giving fighting techniques which allowed you to do more than go 'I hit it with my sword'. Because in most circumstances, regardless of how you describe a fighter, it all boils down to 'I hit it with my sword'. No amount of poetic license is going to give you any real benefits beyond, 'I roll to hit, I do damage'. ToB fixed that. You had stances, which did different things, and you had maneouvres, which augmented your attacks and gave you nifty things to do. This was sort-of brought over into 4e, and while I never played 4e, I could see the DNA of the ToB in it. The thing is, they didn't put it into 5e. Not really. And they really should