@mmasnick @zombierottenmcdonald @bramus I think that's partially tied with the origins of Mastodon and some of the features designed to deter harassment and abuse. Some things that are an extra step or a hassle also make it harder for trolls and harassers.
And I think there's also a bit of an insular mindset among those more tech minded so when the "tourists" who are not as tech savvy come poking around it feels like an incursion into their space.
I do think one of the things that made fb and the birdsite so ultimately popular is that the user interface has become so simple that even grandma and grandpa can do it. It's allowed the platforms to grow into the mainstream.
Mastodon, while I am really liking it, has a learning curve and isn't as super simple. I don't think it's hard either, but I don't know if it will ever reach that critical mass of something like the birdsite without forgoing some of the ideas and features it was founded on in order to pick up the moms and pops and users averse to learning apps/tech.