Most players play spellcasters.
We know from DnDBeyond statistics (2019 "Top Classes by Tier"), about 60.5% of players around level 8 are playing spellcasters.
When including Monk, about 67.3% are playing the magical classes.
The Fighter, the Rogue, and the Barbarian offer some subclasses to play a nonmagical character concept. But even these classes offer magical subclasses as well.
D&D is a game about magic.
The Fighter class offers both nonmagical subclasses and magical subclasses. (DnD published the statistics in 2020, "Top 10 Fighter Subclasses", after Xanathars subclasses but before Tashas. There was a 2019 UA for the Rune Knight that gained some traction before it officially came out in Tashas. I assume the nonmagic to magic ratio is roughly comparable today.) When we look at the Fighter, we know the subclasses that players are choosing.
PLAYERS OF NONMAGIC SUBCLASSES: 76.5%
38.1% Champion (Players Handbook)
17.4% Battlemaster (Players Handbook)
10.1% Gunslinger (DnDBeyond for Critical Role)
6.6% Samurai (Xanathars)
3.2% Cavalier (Xanathars)
1.1% Purple Dragon Knight "Banneret" (Sword Coast)
PLAYERS OF MAGIC SUBCLASSES: 23.5%
13.5% Eldritch Knight (Players Handbook)
6.0% Arcane Archer (Xanathars)
2.9% Rune Knight (UA before Tashas)
1.1% Echo Knight (Wildemount)
Over 23% of players are simply using the Fighter as one of the magical classes.
The possibility of multiclassing and feats allow more magical characters concepts.
Probably gamers who play since 1e, 2e, and 3e, think of these subclasses as if the Fighter "plus" magic. Rather than, the Fighter "is" magic. But many players are thinking, these are magical characters for a magical game.
Moreover, these distinctions between "nonmagic" and "magic" blur at the high tiers. During levels 13 thru 20, even the attempted "nonmagical" Fighters necessarily resembles magical superheroes and mythic warriors, to stay balanced with combat challenges at these high tiers.
There is a situation where many players lack the concept of a strictly nonmagical Fighter as part of their experience of D&D.
For the sake of the balance of the game at the highest tiers, designers need to lean into the themes of "Martial magic". Fighter characters do things that are self-evidently impossible in reallife.