This reive is a pain in the ass to do. And 12h's xD, the longest i was in Yorcia was 5hs, but only because there were not enough SMN/CORs to deal with the "shield". I like the idea as a little upgrade with the KI you get when you defeat all of them.
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No i rather not see unbeatable bosses and when someone found a way to win they patch it out
Everyone here knows the answer to the OP question -- folks nowadays would rage at a flight like AV. Not that AV is a good example of what challenging content should be. I think FFXIV started off with a good spread of difficulty. As long as they keep it that way there should be something that everyone can do, end-game wise.
AV was only not beaten because of the time it took to retry it.
Imagine the final coil of Baha which no one beat yet (at least to my knowledge) but every time you failed you had to wait 3-4days to attempt it again, and had to spend at least 20hrs farming spawn items inbetween.
There is content just as hard as AV in this game now, but there is no requirements for retrying it. If you could spam AV as much as you wanted in XI, it would of been beaten by numerous linkshells in a few weeks.