For this beta 1, you know, Apple will do it much better in the next beta version. But, once beta version is stable enough for daily use, you can use it as the daily driver.
I have immediately updated my iPhone 6 Plus daily driver to the beta 1 of iOS 9, and the old iPad mini. To be honest, they works good, but beta 1 is really laggy on iPad mini.
Ironically, Apple beta software, especially recent beta software, such as iOS 8.4, is stable enough. And, continuity in iOS 8.4 beta works great, while in iOS 8.3 nothing works correctly, in my iPad mini and iPhone 6 Plus.
No one can possibly "agree" that a Beta version of an OS that no one has used and won't be out for a month will be stable enough to use on a daily driver. We won't know until it is released and people have tried it out. I am running iOS 8.4 Beta 3 and it is pretty solid and doesn't crash and respring like the release version of 8.3 did. But before I installed it I read the comments to see what issues people had to see if it was worth it.