As long as i get to be the frog
Consider this. Your Character at level 1 and your character at level 20. Should your character not always be better at nearly everything he does as a level 20 character than when he was a level 1 character. However, this isn't manifested in non-proficient skills or saves. The level 1 fighter with 10 wisdom and no perception proficiency is typically as good as the level 20 fighter at that skill. Why? Does it really make sense for that to be the case? Can the same be said for other skills? What about saving throws? What about non-proficient weapons. Surely the level 20 wizard is a bit better with a longsword than the level 1 wizard, but such isn't actually the case.