"Preparing the watch for development via iPhone" re-occurs too many times

Every time I build my app, at the first compile since Xcode launched, I see this screen, and Xcode is stuck here for any time between 5 and 30 minutes, and I'm not even developing an Apple Watch app:

I have seen similar articles, but with no real resolution. After googling for a few minutes, this should happen when the OS is updated, but it happens literally when compiling any app for the first time since opening Xcode, and it also wastes a hell lot of time, because I cannot even edit code while waiting. Any tips?

Unfortunately this is going already on for way too long,

if you don’t make watch apps, disable Bluetooth to skip this step.