The main reason why it gets disabled is fixed now, the latest RC got cBPF support and as such you can restrict what OPs can be run now instead of just fully disabling it.
Well the reason it's disabled now is the recent history of pretty bad vulnerabilities. It probably needs to go a while without new vulnerabilities before it makes sense to enable by default. It's pretty complex completely unsafe C code, after all.
With seccomp you can disable a single syscall which might be exploitable since you didn’t get around to patch your kernel, with cBPF you can now do the same for io_uring