Do you think bike frame size is less important these days?

i'm five foot ten and have always ridden 56/57 cm frames; just as when it is cold it is -1 and when it is hot it is 82.

when it's cold, my body get slighty smaller and I need a 56cm frame during the winter, but in the summer, a 58cm is required since heat expanded substance.

really annoying isn't it?