I disagree with OP. Most (not all though) of the veterans are very open. Every character forum has a top move list so you are wrong.
Sure we're not all going to reveal our tech, you must understand that a lot of us are also trying to keep competitive. Though it is a mindset behind the an exact tech and I don't see anyone with credit holding back on explaining the mindset.
90% of my Lisa advice is 6pp(p)/3p(p), and you can read all about why I say that's her best tech but that will never sink in until you have good experience using it. It is extremely solid, but there other techs are not as solid which will only ever work once or twice per game (not round) which I will barely ever preach because it will only play into my game, my mind set, how I think DOA5 + Lisa should be played.
If a scrub start spamming it online it will not work at all. They will loose. They'll scrap the tech, and come back to the forum to try to find something else that works. Until they create solid fundamentals and a solid character base, the fancy 10% icing on the cake tech, once or twice per game tech, will just go over their heads.
Creating solid fundamentals and a solid character base means, get good at what you initially know. Example... If I was to start playing Hayate in 5.3, something I'm actually considering, I'd look at it like so:
Okay, he's got mixups going for him, a few easy launchers and is good with his sidestep. I'd just keep it to that and 1 or 2 juggles. For every 3-5 hours of offline verses I may add/find an extra set up or juggle. After 20-30 hours of playing him I'd have a decent Hayate because it he's based on real experience rather than theory from a forum.
*****
I think the real issue is, a lot of people don't know who's who and who's at what level... Who's words have more weight to it than others.
Another thing as well, being good competitively and having a wealth of character/game knowledge aren't the same. Yes they relate. But they ain't the same. If are the same then all the worlds boxers holding titles would be in their 90s. But they ain't are they?
*****
DOA is nowhere close to general fighting game theory.
It is actually, things are just prioritized differently because of the different factors.
My Tekken 5 knowledge... 1. spacing 2. playing safe (This means blocking as well jabs and mids are on par>all else) 3. bnb combos 4. ground game 5.set ups
DOA 5.... 1. playing safe (due to throws) 2.set ups (think counters, think throws) 3.bnb combos 4.spacing 5. ground game.
DOA's counter has a similar function to GG's Burst system. Simularities = initially used while on the defensive to turn defensive/offense around, deny damage, break rhythm, both can be baited and countered for a good amount of damage. Differences = Special meter, limits to how it's used.