I would argue the basic line was reasonably casual.
I had been referring primarily to the Advanced line, so that wouldn't be that much of a problem.
I would still argue that the Basic line was only
relatively beginner-friendly compared to the Advanced line. Yes, it is more--significantly so!--compared to 1e, 2e, etc. You'll never hear me say otherwise. But it's still got a pretty high bar.
Have you, for example, ever tried to show something like
Super Mario Bros. to an adult who never played any video games before? It's an
experience, let me tell you. It's not that folks cannot learn, it's that there's an entire language of terms, mechanics, visuals, symbols, etc. that such a person simply does not know. They have to learn
everything from the ground up, and it's really, REALLY hard not to go racing off at 100x the speed they're actually comfortable learning.
The exact same thing applies to TTRPGs, except that they're even more difficult because they're non-visual, abstract, and math-heavy, all of which are significant hurdles to learning. I'm not saying that Basic is some kind of monstrosity or actively
anti-player or the like, but it was only kinda-sorta new-player-friendly back in the day...and we've learned a LOT more about how to make a smooth and accessible onboarding experience. Like...literally
decades of pedagogy and education studies specifically on how to introduce people to new topics.