on PC the new view is workable. On mobile, where most of my teams works, It is GARBAGE. lot smore scrolling and if you spend all the time collapsing all your channels to make it manageable... dont go anywhere because depending on what you do; They will ALL auto-expand again. Super cool when you have 17 teams with about 4-6 channels in each. Bravo Microsoft. I sure am glad there is NO OPTION to default my organization to separated view also super stoked you automatically changed over my whole organization to combined view with NO WARNING!!! one day the "not now" option just wasn't there and viola here is something you didn't want which also makes your teams work harder.
Hey Microsoft before you reply, go ahead and flip your keyboard around so left is right, top is bottom. It still has all the same functionality so there should be no downside. good luck! also you can change it back but only 1 at a time and any new hire defaults to an upside down keyboard.