If I wasn't a tech nerd I would have given up on signing up for Mastodon and Lemmy. There is a lot of focus on how instances work and it seems a bit overwhelming. I had a lot of internal, 'what if I make the wrong choice', or 'how can I move if I don't like the community' type questions. So being the nerd I am I researched the crap out of it and overwhelmed myself and said fuck it and just chose the popular instances since I know that I can move at a later date.
I personally think this format is favored by a lot of the demographic you mentioned. Most of us, I am generalizing here, grew up being active members in bulletin board systems. Then Reddit came along basically murdered the BB, but there was a good community to interact with. Now Reddit is basically unusable in my opinion because the community doesn't care about the content or the people behind the screen. That brings us here. We learned so much of our trade, laughed a lot, and made real friendships on these types of system and it is a place a lot of us feel comfortable.