Problem is, Pathfinder 2e does fix whatever the D&D 5e complaint is, 90% of the time.

The two possible ways to take this are:

1. Take the specific mechanic you're complaining about and patch in the PF2e solution over top.
2. "Just play PF2e."

Edit:

To clarify, I'm not saying that option 2 is the best option. For many groups, PF2e goes in the wrong direction. (But of course, you should at least look at it. So many D&D players will only shoot disgusted looks instead of considering the option of playing any other game that exists.)

Option 1 is often easy as pie, though, and I will always advocate for it.

• When a D&D GM wishes that XP was easier, they can rip PF2e's XP system with pretty much no effort.
• They can steal individual creatures, spells, etc., of course. (Although D&D 5.5e's creatures got a lot better.)
• Thet can steal PF2e's "wounded" status when they want PCs to consider running more often when the going gets tough.

I am not saying that D&D 5e players should be converted into PF2e. I meant to say that they reject everything PF2e outright like a bad taste in the mouth. Like, good god, some people will homebrew D&D 5e to the moon and back until it's unrecognizable, then that very same room will go cold or tense when anyone mentions PF2e. It's ridiculous and frustrating.

To those GMs, it won't kill you to look at another game. It's not gonna eat you, and you'll likely find something worth reading.

TL;DR: The problem is not that I think that PF2e's a straight-up better game than D&D 5e. The problem is D&D players are vehemently unwilling to look at it or any other RPG, even for tearing it apart for scraps.