There is the camp that says the best way to give fighters "the juice" is through magic items. Its certainly an option, but it does have a few roadblocks.All it needs it’s a
Vorpal sword,
a pair of boots of flying or at least boots of striding and springing,
a dwarven plate,
That will do pretty much the job.
1) There is no guarrantee an item goes to the fighter. The group might just decide the flying boots are better in the mages hand. This is especially true if you are putting in a lot of gear especially to balance the fighter..... players might naturally gravitate towards "everyone gets some magic items"
2) It is DM dependent. A common weapon in this argument is that casters can "do as they wish" and naturally grow in power, whereas martials are more "mother may I", relying on looser DM interpretations to get their power. In some ways this is the same area.
Now if the classes had something where fighters can choose an item to "become" magical that at least puts some control back in their court, but that of course has its own set of possible issues.
The common argument for the "martials" in this debate is that past a certain level point, they want to see that gap shrink. Aka high level martials should be doing "the impossible", not in the same way as casters, but in a way that a low level person would watch and go "I can't believe it".And after a certain point the issue people have is they fundementally want a different level of fantasy then what the point of dnd is, which is a clear gap between "magic" and "mundane".
Most people are fine with the low level martial being grounded by physics and the wizard every once in a while bending the rules of reality a bit. Because the gap isn't that large and the number of times the wizard can do it is relatively small. But past a certain point, the bending of reality gets pretty intense, and the martial is still grounded by physics. The camp that wants martials to close the gap basically want to remove that grounding at a certain point, and allow martials to start doing some reality bending "impossible things"