Yet the SA bulldog with an injected engine and low wing, has a both position (and left/right) yet doesn't have a collector tank to my knowledge.
When parking you set it to left to prevent crossfeed and so loosing the fuel out the vent...
Agree with the comment in that if you change your tanks on the ground then wait to see if the engine is going to stop. We startup on left. When warm enough to taxi we change to right, then change to both for power checks. I believe it takes 10 to 15 seconds at full power for fuel to get from a tank to the engine (judging by how long you can keep the plane inverted before the engine stops...).
I think a lot of this comes down to actually knowing your steed and not to take things for granted!