The way I explain the fediverse is to compare it to virtually any non-prepackaged social relationship.
Want to try a worker-owned business? A communal household? Co-housing community? Nonmonogamy or other non-traditional romance or relationship forms? CSA or other direct farm-to-consumer food production? Any organization or group that runs by consensus?
Virtually all of my lefty friends have some experience with one or more of these things, so they understand that any time you step outside of the frictionless, pre-made capitalist box to create the life you want, it will be more difficult and often awkward, time consuming and confusing. And probably require a bunch of meetings. But maybe worth it in the end.
That's how I explain the fediverse. Because it's been built by and for users and not fashy billionaires, it requires more direct participation, more tolerance for all the rough edges, longer to make changes and improvements. They usually get that, even if they ultimately decide, "nah."