I can't be bothered with the "selector." If you are going to use a hose there should be no need to change a setting, but then I'm used to more modern European uprights NOW that don't have switches "to use a hose."
Vintage wise when I think of vacuums I had when I first started collecting, I think there were 2 uprights that had a selector to use tools/hose and that was on a Hoover Turbopower and much later the Electrolux Z500. The Hoover didn't stay long with me, not because of that function alone but rather because I preferred the clean air design of the TP2/3 series. Also I think that particularly Turbopower used to clog because of the poor arrangement of the side hose usage location. It had little to do with the hose.
I was rather late on when I bought an Electrolux Z517. That was an eye opener; beautifully quiet and such a simple machine to use. The first of the clean air uprights that also had a selector at the back, but again, this was back in the day when uprights didn't have tools on board, or if they did exist they weren't exactly cheap to buy. I hardly used the hose when I eventually bought one for the Z517.
Upright owners shouldn't require a selector in my experience; the hose should be a grab and go function. I think the unnecessary selector just causes problems.
Last year when I bought a Zanussi AirSpeed upright, it too has an old fashioned 'floors to hose" selector and I found that whilst it was neccesary to use to allow suction airflow to occur, the side turn wheel could be adjusted for easier gliding rather than actual hose use; a factor that didn't seem to be mentioned in the user manual.