I feel like people are overcomplicating this (& it doesn't help that most early adopters are techies, who enjoy talking about things like federation protocols)

One doesn't need to understand the Fediverse in order to use it. That's like trying to understand the mechanisms of internal combustion engine because I want to drive a car. I mean, that is fun and there are not-too-esoteric scenarios where the knowledge might even be helpful, but it sure as hell isn't necessary!

Migration was a breeze once I stopped worrying about the internal combustion engine.