I think people hold these views because so many were getting waaaaaay too ahead of themselves in the early days of this thread (there was constant cure talk). When anyone tried to reign in the expectations somewhat, they would be jumped upon and told to stop being negative, etc. The cure mentality became almost cult-like and that's why you're still seeing over-expectations to this day. Frequency Therapeutics didn't help matters, either, because their early promotional materials were a little overly optimistic as well, in my opinion.
People became too emotionally involved with the outcomes of the trials, and this led to a dramatic disappointment. The current goals are far more realistic, but I think it's unlikely that it will help with long-term chronic tinnitus (just a personal opinion).