Good post and a great question!
The only reservations that some seem to have in applying one of the coatings seems to be the amount of
"etching" that is supposed to happen between the coatings and the clear-coat; the maintenance of the coatings; and re-application of coatings when they show signs of fatigue.
People with Show Cars may be hesitant to apply coatings.
People that enjoy waxing and trying out different products may balk at applying coatings.
Personally, I am about ready to pull the trigger and apply coatings to our vehicles.
IMO...Sealants are a nice upgrade from waxes...that's what I regularly use...but the coatings just might be the way to go.
The less I have to go round and round a vehicle, the happier I'll be!
Bob