Isn’t the point of fediverse to provide an alternative to big tech where anyone can create an instance with their own rules? Its not really about having to be subject to everyones voice. Otherwise instances wouldn’t have the ability to defederate.
And people as they got more familiar to the fediverse started either running their own or choosing instances that aligned with what they’d like to see and not see. So I see this thread more as people expressing what they’d like their instance to do when it comes to defederating or federating.
And if values don’t align then people can switch to an instance that more closely does. So its less about voice, but having options to turn to compared to centralized sites where if you dislike the CEO, algorithm, or moderation policies there isn’t much you can do other than leaving, but in the process lose access to all content and interaction.
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.