I mean, in that it requires you to go out, be somewhere in person, and makes it easier to do something else on the way back home. Not a lot better but if your movement is otherwise unstructured it's better than nothing.

setting up for some simple movements at home can really go a long way though. and definitely wish more offices had some simple weights, mats etc on hand (excluding the offices that have a gym to encourage you to be at work all the time)

yes. I have much farther to go to get to the coffee machine or washroom, and people flag me down on the way to talk about whatever problem they're having. or I give a hand to someone who is moving something, or just take a minute to stand and see how the progress is on building the machine

for me, very much different from just sitting or standing in front of my desk and going ten steps to the bathroom and 25 to the kitchen

also for the second part, it's a lot easier to fall into the trap of never going "out" if you wfh and are already set to get comfy on the couch. if you have a commute, you're already out. lower barrier. not a big one, and mostly mental - but it's there. which is why common advice that I very much agree with is to create some sort of commute when you wfh, even if that's just a two minute walk around the block.