It's not your level that makes it difficult to solo it's simply mechanics. Even at level 100 you'd probably still need 2 people minimum to do t5 and deal with the dread night mechanic..

(Though chances are by then players will be doing a million dps and kill it with a single auto attack)

Mechanics are the issue. Was a discussion the other day about soloing the 24 mans. And mechanically speaking you could not clear lota with less than 15 people no matter what level they are. Because you wouldn't make it past stamps without 4 on each pad and at least one smashing it.