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Lots of people soloed the 1st tier dungeons before scaling, but as far as I know nobody ever did one at-level. There have been many solo dolmen at-level videos. People do that all the time now, of course.
I think that there should be an achievement for soloing dolmens and world bosses at-level.
I tried it in 1.5 with my VR14 Sorc, and killed all the mobs and all the bosses except the LAST one. The problem with the last boss is that it has a "1-2 punch" special attack that is seemingly impossible to survive for a solo player. It has some kind of unblockable CC that brings you to the ground, then makes a follow up attack that deals MASSIVE damage. If you were in a group, presumably the healer would resurrect you, and the fight would continue, but this isn't possible for a soloer.
I haven't done Spindleclutch since 1.6, but I doubt that the final boss mechanics have changed. I just switched from WW to Vamp, though, and I'm definitely going to try using Mist Form and see if I can dodge that special attack next time try Spindleclutch.