If you stow your rope properly in your pouch, you don't have to deploy the whole rope before rappelling. It will play out with no issue, and never touch the ground.
I find no advantage in fiddle factor using a separate tether over rappel line to go up, because the tag of rappel line is stowed properly.
There is not a significant difference between using multiple sticks and one stick when climbing a tree with branches. You're still doing all of the same fiddling, and you're carrying more crap in the woods. I have no desire to set up the test to prove it, but anyone can do this for themselves, and If you factor in ALL time and effort involved with using multiple sticks versus one(not just the climbing part, ALL), you'll see the difference is not material.
I'm glad people are adding nuance to the conversation and saying things like "it's a tool that has many good use cases" instead of "one sticking is too fiddly" and "one sticking is the answer all the time everything else is dumb".
I generally carry one stick because it is the answer for a vast majority of my hunting scenarios. And a large contributing factor to this is how proficient I've become with the tool.