Zuranthium
Casting your favorite spell
In 5e carrying capacity is linear and there's no minimum strength requirements to do certain things.
The rules can change. That's the whole point of releasing new editions and having these discussions.
It's ludicrous to say it's too complex to have non-linear progressions. You just look at the table in the handbook and write it down on your character sheet. Wow so hard.
It doesn't matter because it's just a plus two.
It does matter, any change in number matters, otherwise players wouldn't care about their stats. But they obviously do. Hence it's a useful way to differentiate the races and develop immersion into the fantasy world being presented.