It's not about the multitouch swiping. Multitouch wasn't even demonstrated. WebOS is very intuitive, and doesn't require one of 16 different swiping commands. ( for x in {1,2,3,4}; for y in {up,down,left,right} swipe $x finger(s) $y; )

Swiping aside, webOS kicks trash at multitasking because it was designed that way from the beginning. No new commands spliced into the next update. It's what it was designed to do.