I was wondering more how resetting these would be of use to me.
OK, you're going into "heavy philosophical" territory.
If you're asking if you (your character) would get more strength if your companion is maxed out on strength, of course not. You're "two distinct people", so, you're strong as you are, your companion as (s)he is.
But, looking at gameplay, of course that having companion who can better survive, can kill more enemies, or whatever, can have great impact on your ... gameplay.
So, there's potential use. If you can see it and can respec to better companion.