I think that's how many think about them. Interestingly, on another thread here, I asked a few years ago what personal safety strategies people think are most effective and in 50 posts no-one mentioned helmets.
I think people have got the relentless messaging about how vital helmets are - and, if asked directly, will say, sometimes with great vehemence, that helmets are essential safety equipment.
But if you ask neutrally about what safety equipment is most important, helmets don't come into it. (Personally, I think rear mirrors are by far the most important safety feature for on-road riding - I would never have a bike without one)
This, to me, underscores the importance of challenging the dominant public understanding in Australia about helmets being absolutely for all types of bicycling. Without that, I can't see a pathway to legislative change to MHLs.