I currently use taskwarrior and nextcloud to synchronize task states between computers. This web based solution would help get rid of the synchronization part if it replicated enough of taskwarrior's functionality.
What I use most in taskwarrior is creating, starting, stopping and closing tasks under projects, then I use hooks written in python which read the changes from stdin and post the task changes to jira and slack.
So if this project could support web hooks, I could write a glue service for it to call when new tasks are created or states are changed.
To me, size of the image is more important than the number of servers in it.