Saying that but KDE have been having fantastic 1:1 trackpad for a looong time now. And most are usable. What is bad for you? Does gnomes let you configure with gesture for which?
But the result of those gestures(the overview) is not as useful as the overview in gnome and you have to swipe up to go to the overview and swipe up(not down for some unfanthomnable reason) again to leave the overview. A new gesture system has been added to plasma 6 which looks promising. The dev who made it said he has taken a lot of inspiration from gnome.