For me it will be sort of a hacker phone. I always keep two phones for different purposes. I have a Note 9 as my main phone and I'm perfectly happy with it (can't believe they removed the headphone jack on the Note 10! Bleh!).
The Pro1 will be for more experimental stuff and essentially a backup. I also just want to support new designs. Hopefully they come back in a year with a phone with better specs. If this one works well I'll consider making the next version my main phone.