It needs refining so that if you only have 1 other account it just switches to it instead of asking. Since then it is a given which account you want to view.
Only if you have more than 2 should you see this in my opinion.
Then I guess it would make more sense to leave it as is (without the selector) until then, because if I read correctly Business accounts might be taking a year or two to be shipped.
Account switcher in iOS has always brought up a menu, both pressing the long bar at the bottom and tapping at the top on the Account page
This:
however, has never been implemented even though @Jami has posted a Blog saying that it has been and has never retracted it and ignored every comment on it since.