One stat to rule them all, or what if we merged Dex and Str?

[OldTrees1]

Because people in this thread are not engaging with my point. Say I want to play a nimble waif. I use leather armor, a Rapier, get proficiency in Acrobatics, Stealth and Sleight of Hand (but not Athletics), and go around trying to do Acrobatic stunts. I choose feats that enhance that archetype. I play a Rogue Swashbuckler. How is it that my character is NOT a nimble waif? Because I could carry a lot of stuff (even if I don't)?

Say I want to play a nimble waif. I use leather armor, a Rapier, get proficiency in Acrobatics, Stealth and Sleight of Hand (but not Athletics), and go around trying to do Acrobatic stunts. I choose feats that enhance that archetype. I play a Rogue Swashbuckler. And every time I make a Physique(Strength) check I reinvent the Strength attribute by applying a ad-hoc penalty to my Physique check to fix it being too high for the characterization of my nimble waif character?

How is it that my character is NOT a nimble waif using the Physique attribute? Because I had to reinvent the Strength attribute to fix the thematics. Physique gets 0 credit for characters that result in me reinventing Str/Dex.