Can't see why one would need to "play" with volume so much and it's a great feature protecting from accidental volume bump up, some of us still has good hearing and don't want to accidentally blast our ears off when it happens, because in reality most use dongles with IEMs and a lot of IEMs are hyper sensitive.
Premium durability, you don't need it, I need it, I want to feel its titanium weight in my hand, it's not a pair of socks, I want it to last indefinitely, I know nothing last that long, neither do we, so you don't want it, but I do and if I had a choice between aluminum and titnium, I would pay extra for titanium, so here is that.