good thread! The atproto folks are great, and Jack's origin narrative is "a bit frustrating" to say the least, but one point I've always differed on, that I think Jonny calls out really well, is that _data_ portability doesn't matter, and has been a red herring for technologists in the space forever.
e.g., I have zero desire to back-port all my Flickr posts into my Pixelfed account. No more than I want the posters I had on my walls when I was 15 up on my walls today.