My 1020 is my secondary phone and I'm running Windows 10 on it. There are more pressing problems like tethering not working that concern me.
Wow - installing Windows 10 Mobile on your only phone - Wow. Maybe this build!
I am sure there are many more corporate installations of Windows XP than Windows 10 (Tellers, bank machines, retail systems etc etc).
That doesn't mean rolling out XP is good - and it...
Why do you want to sync with your desktop - I can only assume that you have a phone and would like the portable nature of data access that happens when you use it with your phone vs. your PC!
I think there is only time for 1 build - which will need to be completed by the end of June. I suspect this build will then be patched prior to July 29th.