Those Swedish startups didn't form out of nothing. Not only was Sweden early when it comes to things like personal computers, internet access and English, but also notable in many other areas. Almost all successful Swedish companies are at least partly related to gaming, music or telecom. That stems from a rather long organic history of the demoscene, artists and industry. Attitude might have something to do with, but few people would say that the Swedish attitude is anything like what people commonly think is needed for entrepreneurship.
I think a lot of the nostalgia is a result of being uncomfortable dealing with people now being the "insiders" rather than the users. It's much easier to call out the new generation of users or large companies and praise old things than actually creating something relevant for today.
I've played around with creating a relevant version of things like usenet, but at the end of the day it wasn't something I wanted to work on. A large part of the work is correcting for flaws of the Internet that most "hackers" won't recognize. And while you could certainly overcome those problems, I don't think the end result would be worth it. Much of the "hacker crowd" these days aren't, in my opinion, motivated by naive curiosity and shallow idealism (like it used to be), but forced nativity to further their own interests and a opinionated demeanor. That's why many of these alternative services don't work out. Because they aren't motivated by creating something that is nice to use, but to satisfy the convoluted criteria of the creators.
I'd still argue that those experiences and that capability had 'merit' because it was emerging. If you go and try and manufacture hardware in China you can have those same meaningful mundane conversations. Because that's something emerging so there's scarcity of information, everyone is to some extent a beginner and there's therefor incentive to share information. So I don't think it's the people or the conversations, but the environment.
Go read old IRC logs, it's pretty "meh". You can join mailing lists where there mostly "old schoolers", which is also pretty "meh". The people or the conversations where never that exciting. It was all about the context of being exposed to something emerging. You were chatting with people from the other side of the world while most people had barely read a foreign newspaper. I'm sure one could have similar experiences today, but it's unlikely to be in a text interface among adults with $3000 laptops.