Nope. Generally everything is just faster and works better.
Stark in things that used to lag, like moving the map around. Otherwise subtle.
Nobody is forcing you or anyone else.

Drive your Air over to a service studio and play with a model with the new chip and see what you think. YMMV.
Mine was always fine, but it’s hard to say; I always use the center wheel out of habit.
For what?
For what?
There are plenty of other upgrades; heat pump, motor improvements, new TCU, etc.
A new CCC doesn’t turn your car into a Sapphire.
CCC stands for Car Communication Computer - in effect, it controls infotainment. It makes your infotainment system snappier, gives it more memory, etc.
It doesn’t replace anything else.