Quick point of order, if I may: what is the point of all the discussion about wizards and other spell casters in a thread about fighters?
The two classes are about as different as you can get. Yes, high level wizards are
awesome, but sort of suck at lower levels compared to fighters in most of the pillars IME. We still have the linear fighter, but the "not-as-quadratic" wizard in 5E is better than before for balance. I think wizards are very powerful, but also very squishy and dragons find them tasty (after all, if the dragon digests the wizard, he learns the wizards prepared spells!

).
I will never expect a high-level fighter to do more than hold his own (if that) against a prepared high-level wizard. I'm fine with that. In the same way I don't expect a low-level wizard to hold his own against a low-level fighter most of the time.
If, for people who like it, you want to play high-level fighters are akin to demi-gods/superheroes, then sure a high-level fighter can beat the wizard. Not my thing, but you do you of course.
I mean, I am genuinely curious, is it just you feel it isn't
fair that high-level casters are so much more powerful with the right spells? If so, is it the caster class, or just the spells that is really the issue?