What you are missing is bleeding obvious from reading the thread title.
Just because you can't see the SP POV doesn't mean there isn't any.
Did you read the post that followed?
Because - yes, yes it does.
Focus on SP means you get ONLY SP, no MP improvement.
Focus on improving MP means the SP players get the
exact same thing they would have got with an SP-only focus, but you get MP, too.
So why the focus on SP only? I don't get it.
It's like you are offered ten thousand dollars or ten thousand dollars
and a pile of gold and diamonds. And you are saying "Oh, I'm only interested in money, so I'll just take the ten thousand dollars". It's a position I do not understand!