Is downshifting, made easy with paddle shifting, detrimental to the transmission?
No, it is not. The car’s computer will prevent you from doing something dumb. Like downshifting to too low a gear for the speed.
I liked this one. Back in 2013 not many paddle-shifted transmissions matched the revs on the downshifts. So they felt abrupt. Now, every car I test has that feature.