Curious- base coat vs acrylic urehane for base

I had a converation with the Tech guy at Southern Polyurethanes. Like lots of people on here I like their expoxy primer but I have never used their clear. I did pick up some info I was not aware of. S E Tx weather is hoter and more humid than Missouri whereI had spent 37 years playing with all the car stuff.
In a nut shell excessive heat /sunlight will cause topcoats to dry too fast. Be it clear or acrylic urethane. I see they have come out with a super fast reducer and a small amount of a retarder can be added.
I agree the base will be easier to lay down, not that much higher. The costs in bc/cc comes at what quality clear of you use.
A metallic dries faster than a solid.
I am old school but I rather see a 10 or so year old paintj ob in AU faded some, than clear peeling!!!!