Well, lemme answer those two questions:

Kinda in the middle

Yes, Dessalines' development of Lemmy, as it is, is important for FOSS substitute against reddit, and thus has a bit of a crucial role.. however, I'd say there are other competitors for that role (though its political purpose cannot be denied in its performance)

So I'd say it's less crucial than organizing leftists and potentials in real life... but still a bit important when it comes to news and research...

Honestly, just call me back when they use this platform for organizing full-time....