[Closed] 1 x 11 - not convinced

On the one hand manufacturers are banging on about having it all: 170mm sub-30lb bikes that open up more of the mountain. On the other hand, more bikes are coming with 1 x 11 set-ups (and sometimes no front mech compatibility) which means that in actual fact riders will have to push their shiny new bikes up the kind of long, steep and techy hills that proper mountains have (hills they'd have pedalled up with their old 2 x 10 set-ups). Plus the cost is crazy and those posh cassettes don't last two minutes, or so I hear. So what's the deal?