Cassette tapes had "character" too, that little warble-y sound they would do with high frequencies and other such artifacts. Though it was funny to listen to my old Journey mix tape while Steve Perry belted over some high pitched synth, I absolutely don't "miss" that being the only way to listen to music in my car. And, though my mechanical Ultegra is very good, electric shifting is just better 99 times out of 100. And, probably better that last time, too, but occasionally a big mechanical "clunk" followed by a perfect shift is fun, so 1/100 ain't bad!
I think comparing a bike groupset to a audio standard is a little disingenuous don't you? Like audio cassette tapes looking back were proper trash. I don't see how anyone could look back at those with fond memories. Same with VHS and other standards that converted over to digital. I think a manual transmission on a car compared to a semi-auto paddle shift is definitely more accurate? Both are great, but one is definitely better with shift speed etc. But one definitely has more soul. And that's probably why the manual tranny soldiers on in the hearts of car enthusiasts. (I won't ditch me manual even if you held a gun to my head)