Do we really need 2 x no.4, 3 x no.4, 4 x no4 and so on?
At the cutting edge of match fishing where a fish might make the difference between a brown envelope or being an also ran then I’m inclined to think yes but on the more general pleasure fishing stage, where overthinking often leads to under enjoyment, I’m thinking no.
I think your comment applies to so much in angling today; not just float fishing. Like everyone else I have float tubes crammed with far too many floats most which never see the light of day. Its easy to get so focused on tiny details that its easy to overlook the important things such as say spending a bit more time on location.
When I buy say river floats, say Chubbers for example ...I usually just get 3 different sizes ..."Big" , "Medium" and, "Small" ...thats about as far as it goes for me...I rarely look at the shotting weight written on it, I just look at the float and think that looks about the size I will need. Perhaps a load of intermediate sizes would make a tiny difference in very specific situations but any benefit will probably be so small its hardly worth worrying about at least for the fishing I do.