I think the way Mastodon is handling new users is pretty problematic. Not only did this lead to huge amounts of spam on the network because Eugen's instance couldn't handle the amount of new users, but also this goes against the very idea of federation.
Unpopular opinion: if finding an instance is too hard for you, maybe the federated internet just isn't for you. I see people on reddit still complaining about how difficult Mastodon is, and I'm sorry but if that's too complicated for you, just stay on reddit. Considering the level of discourse of both sites, I think it's a feature, not a bug.