FXDTECHTab S6 Stylus Pen Replacement (WithoutBluetooth) for Samsung Galaxy Tab S6 SM-T860 T865 T867 Stylus Touch S Pen (Gray)

How necessary is the bluetooth feature? Is it for lazy ppl? Lost the original and maily use the pen to draw. Just got a "bt" one and it wont connect.

Does it have magnet to attach to the tablet? And does it work with galaxy book pro 360?

Can i used it as advertised with the samsung s21 ultra?

Why is it sold with the Spigen Air case that holds a pen is the pen doesn't fit?