The size of a chain ring doesn't matter, it's the gear ratio, which are larger than ever, making climbing significantly easier. Front Deraillers were ditched because they're (a) now rednundant to get huge ranges and (b) technically inferior (weight, tuning, etc).

Mountain bikers raarely (never?) group together in packs on climbs. Even in an XC race you might get one or two riders but even this is odd on a technical climb.

I think it's redundant with wider, riser bars, you can't cover the brakes which you should be at almost all times, and they look terrible.