it's just something that really emphasizes what I dislike about modern trials bikes. to me trials is about challenging yourself to ride your bike over whatever is put in front of you be that rocks, walls, logs, ramps, muddy slopes or whatever. Having your bars basically makes the bike only good on the rear wheel, it has almost effectively stopped it from being a bike at all. It's not like modern bikes are even bad on the back wheel anyway.
I am yet to see someone have a nice style whilst having their bars tilted forwards too, it usually makes them ride "elbows out" which stiffens up the upper body and "usually" makes the riding sketchy. Having the bars at a normal angle usually ends up with the rider in a more natural position, more flexible on the bike, have a nicer style and allows them to actually ride the bike (Japanese weird ramp sections anyone?)
so yeah, it's just something I hate and won't stop calling people out for it until they realise bars are that shape for a reason.