The bugaboo with today’s avionics upgrades is dealing with the sharp learning curve that tags along. It’s nothing new, and in my work on the shop level, I saw countless owners struggle with their new interfaces, and some almost became smoking craters because they didn’t know how to push the new buttons when workload got high.
Avionics shops aren’t in the flight training business and local flight schools generally aren’t versed in the variety of retrofit avionics that exist in custom interfaces. Thankfully, some OEMs have stepped up with decent training opportunities.