Why was dex made so powerful?

[Galactkaktus]

16 actually, as your max hp increases with 1 hp / lvl, AND when you use your hit dice to heal, you heal 1 extra

still ... I'd take 5.9 / combat over 16 in total.

To nitpick further 12 every long rest and 4 extra that you get when you go beyond the amounts of hit dice you regain on every long rest. And if you consider critical hits the damage from an attack from a giant ape should deal 1,4 more damage per attack to both the dex and str fighter. Which should lower the 5,9/combat to 5,452/combat.