Also, there is some talking on github on how they will probably completely drop LVM in the near futur... That's not what someone should expect from a Linux installer!
It's a shitshow. Looking at their repo's issues list has lots of noise, but the worst of them is that the LVM issue has been open for over a year now. Sure, open source, anyone's free to work on it by why would distros use such a feature incomplete installer?