It wasn't a "blanket" question. It was asked in the context of the cost and effectiveness of various plugs, from foam to moulded, via the rest. The OP didn't want that discussion, but this is a subject that is very pertinent to many musicians, many of whom play way too loud and don't take enough precautions.
I see many guys on the "circuit" who now use hearing aids. Hearing aids are much more expensive than moulded plugs and never sound as good as natural hearing. It's an important subject to everyone.