I understand the nuance here, but there is no evidence this is actually true. It certainly is not true at my table.It alleges that experienced players who enjoying leveraging the rules (a certain playstyle that rhymes with shower tamer) will overwhelmingly choose casters over martials. It does not make this claim of inexperienced players, or of players who do not participate in that approach to the game.
I gravitate towards Rogues first and Wizards second. If what you are saying is true I would always play wizards.
We have one guy at my table who you might call a metagame and every time he is going to play a Fighter-Barbarian multiclass every time. Since XGE he likes to add gloomstalker into that too for the extra attack on round 1 but that is hit or miss because he does not always want to invest in wisdom to multiclass. He is going to play a Dragon Born, Half Orc or Goliath every time and he is going to get GWM at level 4. This is what he likes playing.
He is an experienced player and he likes to "work the rules" to make his character an ultrapowerful melee build. I think there are just as many of those shower tamers as there are wizard shower tamers and as long as that is attractive to many (and I think it is), the argument to buff martials is weak IMO.