Hi Rester1505,
you are completely right! I don't need the Button, the Controller is really Top! Better as the original Controlller from the Mavic 3 Pro, as the Pro Controller, bigger better Display faster , 1 word PERFECT!
The DJI RC PLUS from Ebay works great!
The DJI RC Plus works great with the Mavic, Mavic 3 Pro and also with the Mini 3 Pro. I've been flying with it for 3 weeks now and can only say it's great! The Fly App can be updated without any problems.