Maybe apples and oranges, but I have 2013 Culprit road bike with TRP Spyre mechanical discs operated by Ultegra Di2 levers. They were original to the bike, and work great. No modulation issues or "spongy" feeling, easy to adjust, and stop very well. The TRPs have an internal spring to keep the pads from dragging on the rotors. Been over 6 years now, and never had a problem with them. I'm running 160 front and 140mm rear rotors, both TRP and Magura (on a spare wheelset). Mine date from 6 years ago, not sure what the current TRP models are, but worth checking out. Mine came with compressionless brake housings, though I've never changed cables or housings.
