I'm A Banana
Potassium-Rich
If Michael Jordan represents an innate physical talent of 0.001% of the population of the world today, that means that there are approximately 6.5 million MJs out there.
Right.
Only, this is D&D, not real life. So when we say "Michael Jordan can fly!" we mean it literally, like he's been actually fathered by the God of Winds and given a magical pair of Nikes (by the actual Nike) that assure him victory in sports whenever they are worn.
The top .001% is capable of so much more in a fantasy world.
Fighters being Michael Jordan and wizards being Merlin is part of the problem - - they are very different power scales. You could make spellcasters suffer more for their limited powers, making a more "gritty," or low-powered game. Or you could let fighters be as magnificent, going more Wahoo. D&D has been more inclined to the latter, as evidenced by things like wizards being able to make a demiplane and vorpal swords that lop off heads when they hit things. For most of it's life, it's been able to be the former, too, but it hasn't been inclined to be the former ever.
But either you're Hercules and Merlin and Orpheus, or you're MJ and Stephen Hawking and Prince. A party including Hercules and Orpheus and Stephen Hawking is not going to work out well for the astrophysicist.
That's kind of the complaint here. I can get it. I don't think it's a "wizards are overpowered oh noes!" problem, but it's a real issue with not feeling as potent because of a lack of narrative control. Spellcasters get plot control as part of their class, and characters that don't cast spells don't get to be as proactive, and that's not so cool.