I have Campy 11 speed on all my road bikes. I remember starting out with 5 speeds, then 7, then 9, then 10 and now 11.
I also remember that each time the same arguments were made: 1. Just marketing and/or 2. Unnecessary upgrade.
Personally, I find that the extra gear gives me more choices and makes riding more enjoyable.
Should everyone make the switch? Probably not.
Is the 11th gear worth having? In my case yes.
YMMV,
Good luck with your new bike.
Ride safely.