Non-LTS kernels very frequently go EOL before OpenZFS supports them, or there is only a very brief window that there is support for a non-EOL kernel.
In practice, it's hard to use a non-LTS kernel with openzfs for any significant duration.
What stable means in this case is subject to individual use cases. In my case, I don't find having to wait a bit for ZFS to catch up despite being on an EOL kernel to be catastrophic, but after having some time to think, I can see why someone would need an LTS kernel.
This impacts distributions like NixOS in particular, which have a strict policy of removing EOL kernels.