all jokes aside, does the size of the blade really matter?

looking through the threads on this subject, it seems that most people get just as good of a shave with a 3/8 as they do with a 7/8. however, people definitely have a preference, and i'm wondering why that is.

i have two new 'smaller' razors (a boker 4/8 and a filly 3/8), and find that they are both nimble and light.

i also have a dovo 6/8, which allows me to scythe very easily but is harder to use on the corners of my mouth and around my chin.

thoughts?