Most people who aren’t tech savvy aren’t reading Martin Fowler’s blog. It’s okay for bloggers to write for their expected audience, rather than having to think “how will what I am writing be interpreted by all possible readers, e.g., literally everyone who can access this web site.”
As for Mastodon itself, yeah, it would be nice if it got better about its terminology and “marketing” to people who aren’t nerds, although one can argue this is endemic to open source culture at this point (cue unceasing arguments about Calibre’s wacky UI choices, The Gimp’s arguably offensive name, and so on). Those are trivially solvable problems, though.
If Mastodon is “something that people just post to with very little comments and interaction,” I would suggest that it’s long been a network effect issue; it’s very hard to get any new system that depends on user-constructed social graphs off the ground, until or unless that graph exceeds some hard-to-define node count level for a sufficient number of users. Anecdotally, I have seen a lot more activity on Mastodon over the last week; whether enough will stick to push it over that magic number remains to be seen.