I should add: In spite of all that, I will probably dive my compressed neoprene suit a lot more often.
I have never (yet) actually flown with a drysuit. I'm sure that will come, but most of my diving is driving distance.
Most of my drysuit diving is in water of a temp that will work well for neo with thin undies.
Most of my drysuit diving is not when the air temps are really that hot.
I almost always dive with a buddy, who can zip me up.
In other words, trilam is more versatile, but I don't need that versatility most of the time. Which is why I'm happy to have both kinds of suits.