I hear you my friend, however if you picture an old classic groupset on a modern carbon frame, it would look awful.
Likewise most people don't like modern kit on an old frame, but that is accepted by some & it can work - restomod.
Personally I have ran 11sp Shimano on my road bikes for 10 years now in Ultegra & DA9000, for me it is peak Shimano, it works amazingly, has a sweet finish infact I'd go as far as saying DA9000 is Shimano's finest ever looking groupset. 9000 had an update to the STI's to cure the cable fraying issue within the lever ST9001, I've never had an issue. (which you did mention LOL)
I'm not here to defend it or sell it. Just my 2 cents worth coming from someone that admires classic bicycles & rides a few modern ones. Happy Weekend!