I don't really agree on the whole tbh. Specifically, the one thing that's still keeping my Reddit account alive is that there's a bunch of communities that don't exist on any other platform because they'd need enough of a "critical mass" of users for it to make sense; and they're too niche otherwise.
A huge influx of users certainly comes with.... Challenges, I do not deny that. But I'd also love to not have to use Reddit anymore solely because of its active user count. And new Lemmy users are unlikely to come from Twitter or something; as it's a different kind of format.

Also, I think the sentiment of "the Lemmy community rn is also formed of at least mildly tech-savvy people [...]" is kind of exclusionary for no real reason, I don't think you have to be tech-savvy to have a good perspective on things, make a good joke or all in all be a positive person to interact with.