I can't believe the game has been in development for 6 years and they couldn't find the time to give companions appropriate stats. No one ever questioned that maybe the most beefy character in the game should have more than 10 Strength.
I think it is more about not caring about such level of cohesion. Thank you for mentioning the stuff in your first post - personally I haven’t been paying that much attention. The game is super easy on normal, so I haven’t been terribly concerned about character’s stats. I just found Halsin lack of strength to be hilarious.