GP has always sounded like the dad that's heard enough of Max's shit. It seems to work for them well!

I didn't think it was anything out of the ordinary, they're mostly straight forward with each other. They just have a great working relationship from what I can see.

There's no notable change here, that's just how Max and GP prefer to communicate. Many driver/engineer pairings have the engineer prefer a calming communication style, but Horner has described Max and GP as a bickering old couple, and the analogy is apt. Max doesn't want to hear that he can do this or to keep his head down, he wants to hear that there are no strategy options and nobody cares how bad the tires feel until the laptimes fall off.

You mostly don't hear these radios except from the dominant leader and if the radio messages get truly spicy (hi Yuki!). It's a very different style from Lewis and Bono, which was the last pairing we heard a lot of these messages for. But it's how the two of them prefer to communicate and doesn't reflect diminishing respect or satisfaction with the relationship.