And that is the interesting thing... both 3e and 5e were complete re-works - Yet they both did absolutely nothing about the underlying issues of LFQW.
Magic users be popular...
Interesting take, but I disagree. Both addressed the issue - but in opposite directions.
3e - introduced a good mechanism to keep the classes in more parity, but then dropped the ball on it - feats.
Fighters got lots of feats in 3e (well more than anyone else) and if the feats escalated like spells did then fighters COULD have kept up to the wizards (especially if they had really gone with fighter specific feats). But WoTC decided not to do that - the "high level" feats were a complete joke compared to high level spells! Not until the very end of the line (PHB 2 I think) did "official" high level feats start appearing that were actually anything resembling high level.
Casters, on the other hand, not only got great combat AND utility spells, they could easily make magic items - so they could EASILY have all the utility they needed without sacrificing combat power. SO 3e didn't just "not address the LFQW issue" It basically doubled down on it!
5e, on the other hand, actually does address the issue A LOT. First,
concentration, this single mechanic is probably the biggest hamper to casters in any edition. No more invisible, flying, spell hurling wizards. Next, there has been a big clamp down on summoning spells, they exist but they are a shadow of what they were in prior editions. After that, charm spells are also a shadow of what they were in prior editions. Durations are shorter (mostly), the consequences are bigger (generally an automatically angry target) and concentration limits amounts severely. Finally, Item crafting is back to DM controlled and not the automatic item creation factory of 3e. So wizards can't just automatically have a scroll, potion or wand as needed for every occasion. In combat, the gap is (IMO) mostly closed, at least in terms of effectiveness and power level. The casters still dramatically out option the martials (especially fighters) in the other 2 tiers, and I'd love to see some improvement. But I just can't see saying no progress has been made or issues addressed.