I like the idea of such a federated platform but I'd love it to have a deeper integration in existing federated ecosystems.
At the moment, my feeling is that too many new concepts and platforms are being built in parallel. Especially in face of the still relatively small total user base. Would be cool if you could use the same account for Lemmy/Mastodon/Pixelfed/Flohmarkt and have a deeper integration between the platforms, e.g. subscriptions to Flohmarkt categories so they appear in your Lemmy feed or local stuff being automatically linked to local communities.