A few things.
First, that is _laughably_ far from where we are today.
Second, to the degree we are there it has very little to do with ActivityPub and more to do with people believing in the vision of the fediverse.
Finally, given the lack of support for (and the massive resistance toward) quote-boosting, differing formats between platforms, etc it's hard to see how you can claim that the vision of not using screenshots is something that we are approaching.