This is not part of the requirements for localfirst, it's part of the eventual goals. Here linear meet the requirements because you can continue to edit offline

This is not part of the requirements for localfirst, it's part of the eventual goals. Here linear meet the requirements because you can continue to edit offline, and if they have a server outage then you don't lose your data because you have a local copy. However a collaborative software is of course useless in the long term if you can't collaborate anymore.