I mean, some of them are real simple (i.e crouch teching). When I first started learning to play Persona, it was my first anime game and first step outside of SF4. I spent my first year with that game being ass and basically learning what I could off locals and Dustloop and stuff.
At some point I became friends with some of the strongest NA players at the time. We were doing something about the game, and I was like "yeah, I have trouble with throw/rejump stuff"
"oh, you can OS that"
"how?"
"upback and grab, do it at this timing, be careful because jump start up and lows and stuff"
"...oh"
I spent the first year of that game not knowing an OS that high level players were all using, that would've helped me way earlier and would've stopped my ass from getting air grabbed orz. I was actually using a mix up I stole from a video of Yume, turns out the mix up he was doing could be OSed, but he was doing OS baits before he did it. I had no context to actually think about that technique and what he was doing other than thinking it was a cheap mix up. It also sucked when we started learning fuzzy OS stuff and it took me a bit longer to learn because I had never really learned defensive OSes before and had to rewire my brain to the concept.
It was funny because I would start to use them and people would get frustrated. I would tell them what I was doing and how to stop it, and they wouldn't stop it or use it themselves. "Why don't you actually make a read and play the game M'Ellis?" I actually developed a bad habit at some point of being lazy and spamming fuzzy jump vs low level players(we all did). Luckily the upper layer Persona people caught on fast enough and I got used to an environment where if I did that I'd die. Stopped that real quick lol.
It's all really simple concepts with really negative stigmas attached due to the word "OS". I'll just start saying "fuzzy defense" instead of OS from now on to see how well that goes over. I'd wager it's about time to introduced those once players have basic offense/defense figured out and it's time for them to start combining decisions. "Hey, you know how to tech, mash, and block, right? Let's try putting those together."
The real unfortunate part is like, let's say you're somebody who's not super good but understands all the basic fighting game stuff. You go to learn BB, and you don't need that basic bullshit, but at your "beginner level" that's all you get. Those techniques that are required for mid level play and higher are locked behind some gate that says "this is complicated, you won't need it until high level play, go watch Juicebox's video for the 10th time".
Have some faith in the people who made it past the bare minimum to be able to think some. Also we're hella bad at explaining it, something we should work on. I make it sound way more complicated than it is. My experience with the community in this regard has been overwhelmingly negative though so I'll keep making megaposts about it.
Edit: Also, at that point, most new players just start looking for new combos, set ups, etc what have you and start grinding themselves into oblivion cause that's what they were given. Now we at least have Juicebox making vids to work on critical thinking and footsies, but I mean that is that. Giving them more useful techniques to learn than combos and set ups and gimmicks and blah seems like a smarter investment.
I'm also going to start replacing the word "fundamentals" with "critical thinking". I think fundamentals actually doesn't say much about anything, it's a catch all term people use for anything not execution related these days.
P