When I first joined the beta I was put off by instability, glitches, and lack of functionality [i.e., Good Lock homeup not supported as an example] and I tried to switch back. Smart Switch didn't work for me. There is no Beta tag to one UI 8 and therefore Smart Switch didn't recognise that I could 'downgrade'. I'm therefore still here, but ultimately, I am fine now that there are stability improvements in later Beta versions. Good Lock improvements will come in time. It might be worth confirming that the downgrade option will work still or add a Beta tag so that Smart Switch knows to offer the downgrade option.