Think you are talking about the One UI 5 Beta
Everyone doesn't hate it as it brings new features to my S22 Ultra.
Not sure if the S20 range of phones will have a Beta program, but probably the general release software.
Beta programs are not for phones that are used as an only device.
Quite often there will be issues with the software or apps. Particularly banking Apps.
So it's not recommended for people that rely and need their phone
If your someone like me. I have multiple phones I'm using, so I can try out Beta software and still use my other phones for things like online banking
