CANPA and CDA are great if you put in the right waypoints and get your altitudes all right. I have seen some cases where folks get that all screwed up and end up with the EGPWS going nuts. It isn't hard to do,
Start your descent at the Initial approach altitude and level off at the MDA - not a lot of button pushing here to enter data incorrectly. OK- Pushing the stopwatch.
Watching some of the guys in the sim do CANPA all bets are covered but generally no one is watching the store. Lots of chatter about checking altitudes every mile but the purpose of the exercise, to get the airplane safely on the ground, seems to take a back seat.
I still do the dive and drive in my own plane. Much less work load. Single pilot no autopilot.