If there is a kanban extension or something of the sort you might get the drag and drop list you want.

There is another Google Keep like app called NotallyX. Can even import in your Google keep backups. You can set up password protected auto backups with the app.

As for syncing syncthing as others have mentioned would be the best solution that would let you be able to use whatever you choose to go with.

They didn’t have seat belts either. So simplest explanation is that people were still figuring out what safety features were necessary for a new invention that started gaining traction. Lot of safety regulations that came into play happened after disasters like building codes or work place regulations or food expiration. People learn from tragedy.