People who liked fighters back when might think Wizards are unbalanced now and people who like the new wizards and are into the new representative literature might wonder why D&D fighters are lame compared to the wizards and new literature
I'm not sure I buy this one actually.
Back in the day, Fighters were the undisputed damage kings. If you wanted to kill stuff really quickly, you played a fighter. Magic Users, at high levels, might come close, but, nobody else was even in the same league. Plus, the monsters died much, must faster as well. Your 2e fighter could drop 7 or 8 HD monsters in a single round (not likely, but possible) without magic. Meaning that your fighter was absolutely death on toast.
Then, 3e rolled around and the fighter types got absolutely hosed. Fighter damage was cut in about half. Then, the monsters got about 3 times more HP. Then, rogues and clerics were bumped up to be competitive with fighters in damage output. The fighter might have had an edge, but, not by a whole lot. And, of course, the wizards just got all the limiters taken off.
Now, 5e has somewhat reined in wizards to an extent. You generally don't need a spreadsheet to run a high level caster in 5e. But, the fighters are still no better than anyone else at combat. And all the other classes still get all sorts of ribbons and bonuses out of combat.
The whole "mythical fighter" thing is also very much a reaction to the fact that people are finally (after many, many years) starting to play higher level D&D. In 3e and earlier, games ended at 10th level. There was virtually no support for play over 10th. But, now, lots of people have hit low double digits. Play most of the Adventure Paths and you'll generally hit around 15th level or so. Suddenly, it gets really glaring that the non-magic classes are really falling behind.