Yeah i think they removed that spen feature to support magsafe because they previously had issues when magnetically wirelessly charging your spen would act all weird when writing
Ah yes, strong magnets does drag the pen input everywhere, but if not wirelessly charging it seems fine at least for me.
Plus I'm not exactly sure that this is due to bluetooth on the Spen. The Spen primarily works through technology that Samsung bought from Wacom, which involves wirelessly charging the pen nib from the phone screen. So, chances are that it would still be affected even without bluetooth. Just my guess though.
