Same here. I used proxmox for 8 years and have recently dumped it in favour of a couple of incus machines running OCI and LXC containers.
Much lighter, much faster, and to be honest, more straightforward when it comes to storage abstraction, which I think proxmox does in a very… convoluted way.
That thing about docker being so badly behaved in unprivileged containers seems to be a proxmox problem, not an LXC problem, as I’ve discovered running LXC in a non-proxmox environment.