Why is this so important?

Human 4'8" +2d10 110 lb. × (2d4) lb.
Dwarf, hill 3'8" +2d4 115 lb. × (2d6) lb.
Dwarf, mountain 4' +2d4 130 lb. × (2d6) lb.
Elf, high 4'6" +2d10 90 lb. × (1d4) lb.
Elf, wood 4'6" +2d10 100 lb. × (1d4) lb.
Halfling 2'7" +2d4 35 lb. × 1 lb.

I could roll snake eyes and a human is what, 4'10". I could roll 20 for an elf and have an elf that is 6'2". According to the rules, you can have some elves taller than some humans and vice versa. Is it really that big of a deal?