No I get your point and it is a tight fit (at least the stuff I've installed and I'm sure each manufacturer has a different vendor and some are definately worse than others) but there is also junk, mis-made, incorrect sized screw trim out there. I'm speculating saying it shouldn't be a hard thing to do...some of us are older, not as mechanically inclined, etc. :)
I'm sure you don't mind the short skirt though. lol
I've honestly have had great luck over the years with my RV's and screw trim!
Besides...I'm off today, have a nice 10 Barrel IPA in my hand and smoking three racks of St' Louis ribs on my traeger. Life is good!!!