So... I started a new game with my kids.
My son and I took a long road trip (6 hrs each way), and spent quite a bit of it discussing D&D. Eventually, the discussion reached the following conclusion: he'd really like to play a binder, but they're weak and he likes stronger characters... Eventually, we of decided to come up with a setting where all the tier 1 and 2 classes were banned (with in-world reasons), and to also beef up binders a bit. We're basing it off the Sky Raiders book by Brandon Mull, if you're familiar with it (and if not... you should go read it right now). The setting is technically a post-apocalyptic Eberron where his old character was responsible for and/or involved in "breaking the world".
What's left of the material plane is a series of "islands" floating over an endless void of space. Some of them are fairly large, like small continents, but most are small, and they all move around slowly with respect to each other... So there are no reliable maps, and getting around involves flying somehow (there are blimps), and is insanely dangerous (most of the ruins on these "islands" are haunted and/or housing some kind of terrible, ancient evils leftover from before the breaking of the world, etc). It can also be very lucrative, and hence of course there are idiots who go around plundering them. They are typically called "sky pirates", and are pretty deserving of the name... because they are not averse to robbing and/or stealing children and conscripting them to use to explore the (insanely dangerous) ruins.
The first adventure involved only my son's character, with him starting out as "level 0" and encountering a medusa who instead of turning him to stone decided to train him as a binder. He then went back and joined the "crew" he'd been a slave of previously as a "full member", and they raided a keep with 5 skeletons, with the two NPCs with him both getting beaten up pretty badly (one below 0 and one just barely above), but no one actually dying (which I regard as a success when DMing 1st level characters...).
We've brainstormed quite a bit, and are even considering writing up a campaign book for this. A few details:
1) the gods all died and/or were "cut off" from the world during the "breaking"
2) the prime material plane was actually cut off from or moved further from the outer planes, and closer to the elemental planes
3) all the dragons died as part of the "final battle"
3) because of 1, 2, & 3, there are no wizards, sorcerers, clerics, druids, etc. (Basically all the T1&T2 classes).
4) "Benders" are a thing (as in Avatar: The Last Airbender). We're using some homebrewed classes that look a lot like warlocks. Here's the Airbender class:
https://dnd-wiki.org/wiki/Bender_of_Air_(3.5e_Class) (Oof.... looking at that, it is incredibly weak... will almost certainly buff it...)
Debating on whether to allow beguilers, warmages, and dread necros. Leaning towards yes, but making them mostly NPCs.
We're using PF1 as the base ruleset, but allowing 3.x material.