Magic is supreme, physics breaking and magical.
So what's wrong with a martial warrior honing his skill to the point of becoming supernaturally proficient with it?
Evidence:
Literature:
1940s - Gandalf and Saruman are more powerful than any of the martials in that adventure. Bilbo gets magic and is able to do truely amazing things with it.
Gildor Inglorion and Glorfindel could kill them both with swords, and in the case of Glorfindel, at the same time. Glorfindel killed multiple Balrogs and Gandalf couldn't survive even one.
1970s - Elric's sorcery and his magic sword are more powerful than his martial abilties (and he is genrally a martial in a low magic world even)
Elric's sorcery is slow. If someone jumps him with a sword, it's the martial aspect that's going to win the fight. The sword only matters if it hits and tastes blood.
1990s - Raistlan elevated himself to literal God status through magic
And yet Chaos the supreme power was only defeated because Tasslehoff stabbed him in the foot with a knife.
2010s - The power displayed by Gromph, Pickel and the young Ivonnel eclipse anything the martial companions of the hall can do and when they do match up against magical foes it is usually by leveraging magic.
Yeah, bad writing isn't somethin you should lean on. The power displayed in some of those Forgotten Realms books also eclipses most things in the Epic Handbook. It was almost as if the authors had never played D&D and didn't know the limitations of things.
Movies:
DNDHAT - All of the spectacular achievments are done by magic. Literally turning an entire city into undead, the timestop spell, the resurection. Guile and wit play a part to help carry the day for the mundane characters, but Holga isn't doing anything that is even close to what is done by Sofina, Simon or Doric.
Here you have a good example, but it's not one that says that martials can't be super strong, either. They heroes rely on and are in awe of the martial prowess of the paladin.
Can you provide a single example in movies or literature where martials can do things physically that rival what casters of equal level can accomplish? Even one example from fiction?
Easily.
Nine Princes in Amber. Martial fights are much more prominent and reliable than magic. It's skill with the blade or physical prowess(Gerard) that are most prominent.
The Black Company. They take out the most powerful wizards in existence on a regular basis with martial plans and execution.
King Arthur.
Achilles.
Hercules.
Blade.
Many of the martials in comic books.
You might be tempted to say, but they were mostly demigods or had super powered strength, to which I reply so what. You can hone martial prowess and ability to supernatural levels and contend with magic. You're still martial, but just a lot more powerful than Joe Average the Swordsman.