We weren't aware of Open Project previously, and we're glad to hear about it.
I think you're right, Focalboard is a lot earlier than Open Project, and it doesn't have as many features.
Focalboard was starting during the Mattermost 2020 Hacktoberfest last year: https://mattermost.com/blog/hacktoberfest-2020-recap/
It's in the early stages of development, only v0.6 right now: https://github.com/mattermost/focalboard/blob/main/CHANGELOG...
That said, we're working on it constantly and excited about its future.
Of the features Open Project has now, are there one or two top priorities you'd suggest we consider adding to Focalboard?
We'd love to hear any feedback, feature suggestions or bug reports: https://github.com/mattermost/focalboard/wiki/Share-your-fee...!