In an ideal world, my data would live on the instance but as soon as its mutated a local copy is sync'd through the browser/app. That way it's my data, and if the instance goes down, I can choose to sync it somewhere else.
Ideally this would be packaged up in one application, so for different kinds of "sites" the mechanism for syncin'g and migrating would be the same.
Consumers want to not care about the details. Most people don't care much about federation, p2p, full decentralization or centralization, until something crashes. As long as they have no problems, they would even play with the devil.
Centralized solutions, tend to be easier in usage, faster, and with a more stable moderation who maintains the peace. This is something decentralized solutions can't easily replicate, but it's not like it's impossible. It's just that so far not many are trying to climb this mountain, because implementation and maintaining of centralized systems is also easier.
You are partly correct. They do not care about details, but they want things as simple as possible, and decentralization makes that harder. See all people complaining (or don't understanding) about having to choose a mastodon or lemmy instance.
And copy+pasting usernames/post links that you have open, to search for it again on your own instance so you can reply... is not simplicity.
I can only guess as mass readers tried to migrate to bookwyrm, how many people would be complaining that they are trying to add a book a friend is reading, but it's not showing for them - because it's registered on another instance but they didn't realize
Or why they see different ratings, or less number of reviews than their friends
I think it’s also important to make signing up as frictionless as possible. I would guess most people don’t care if it’s a federated service or even what that means. If you ask those people to choose an instance, you are instantly going to lose some of them.
The point of decentralization is not to destroy the ability to centralize (see e.g. git versus SVN and then look at github).
The advantage is that federation and decentralization empower an entirely new set of use cases, archival strategies, development, and accessibility affordances that may have not been possible before. While enabling the town square & metcalfe's law that are advantageous to many people / use cases.
- The Mastodon flagship instance has 25% monthly active users of the total network https://fedidb.org/software/mastodon
- Lemmy flaghsip* (which is newer than Mastodon) has 38% https://fedidb.org/software/lemmy
As time goes by people will distribute over the other instance. And even now it's not so bad as you make it seem.
* Not even the actual flagship maintained by the developers, but one created by the community
You either appeal to people who really care about decentralization (an extremely small group) or you're not really decentralized.
It still allows you to pack your shit and move somewhere else should a narcissistic billionaire buy the flagship instance.