Productivity is the current foundation, but you can think having an open source Bloom tractor in some years.
I've dared the Google comparison, because I see Google as an innovative tech giant who have an app for all our needs.
We have the same goal. But open source.
You don't help your case by misleading your prospective customers, who are themselves self-identified "geeks" who might be able to help you make this goal a success.
I used 'Google' because it's really clear for everyone how this company is shaping the world (for the better or the worst).
They might, but that's a rather uphill battle.
I've dared the Google comparison, because in my point of view, It's THE company who is changing the world.
Besides the opaque sign-up scheme and a total disregard for standards (your calendar/contacts "sync" integrates with which clients?), even today your project is much less than Nextcloud...