What does this solve that a standard CalDav server doesn’t? Plenty of FOSS apps for web, Linux, iPhone that can all sync to the many caldav servers like Baikal? Caldav servers can handle unlimited numbers of tasks.
Also I read through your page it seems you don’t have CalDav implemented currently. How do you sync between local applications then? Would you sync with other CalDav servers? Or is the project just the webui currently?
Maybe I’m missing something but I don’t see how your couldn’t development meets any of these requirements except the nice ui
Why must everything federate? Would you federate a car?