I’m not talking 3 hours worth, but I do think there’s value in tying a horse (not up, not around, not anything weird - just regular straight tie) for a short period after a ride. I normally tie in their stall though.
Sequence would be like - ride horse 1, tie, ride horse 2, untie horse 1/tie horse 2, do chores (bucket scrubbing, stall picking), untie horse 2, brush all sweat marks off, snacks for everyone, head home.
It’s not used as an exhausting technique. I call it horsey meditation.
I didn’t learn this from CA. He strikes me as a real asshole, tbh, and you can see in his training he really roughs up horses.