You raise points I'm finding really interesting.
Let's say you never saw the episode and I showed you the part where Fluttershy is in Angel's body going through the Everfree forest.
Would you have ANY IDEA that was Fluttershy in there? I really doubt it. Fluttershy in his body, and especially since she couldn't talk, doesn't really give you anything all that new or interesting to watch.
You mentioned this in the stream, and it's where I started to realize how much I appreciate this episode.
You're absolutely right in your assessment of the scene, that if you showed that clip out of context we wouldn't have any idea what's going on there. What that tells me is that the plot is meaningful. The plot here isn't just a series of actions. In that scene at least, the plot forms an invisible layer hanging over the actions, flavoring what you're seeing. It's more sophisticated screenwriting that what, say, G.M. Berrow would have done.
I feel the fun of a bodyswap is to see characters have to act in ways they normally wouldn't act as.
Isn't that only half of it though? The way I see it, there's two main ways to do a bodyswap plot.
Type A: Characters attempt their old lives in the wrong bodies. Hijinks ensue.
Type B: Characters attempt each other's lives. Hijinks ensue.
This episode is very little Type A but very much Type B. We don't get much Fluttershy doing Fluttershy things in a bunny body (just the Stare, I think), but we get Fluttershy living an unfiltered experience of Angel's life.
Angel is more of a mix of Type A and Type B. He does attempt to do Fluttershy things, just with great apathy.
It is a little weird that this episode didn't pick one type or the other and didn't try to be more symmetrical about it. And it is surprising that it's all played more for drama and character development than for hijinks, but that's how this episode rolls.
The obvious answer to this is what a fan did, as I believe you've probably seen the fan animation of Rarity and Rainbowdash switching bodies.
There we get Rainbowdash acting as Rarity and dressing up in pretty dresses, while Rainbow Dash messes around with being a unicorn. Heck if I was able to see Rarity trying to be 'Fashionable' while in Dash's body and Rainbow trying to be athletic in Rarity's body, that would have been great!
I'm gonna watch that now. It sounds great.
But instead we got, "Angel" basically just being a bunny, and "Fluttershy" acting like a jerk. Something we've seen her do... what seven other times now?
Here's one point I fully disagree with. This wasn't just Meanshy again. Obviously there's a heavy similarity, but the small differences make it. It's not Meanshy's voice. I mean yeah, it's the same voice, but not the same "voice". The tone and cadence is noticeably different. It's definitely Angel's "voice" coming out of Fluttershy's voice, which is great voice acting.
The character's different too. Meanshy is highly aggressive, while Angel just doesn't give a toss about any of this.