I think there is a widely held belief by some that people like myself are seeking a wound and vitality module. Perhaps some people would like that but I'm very much for the simplicity of hit points. Whether it was intended or not, we can debate that another time, I was able in older editions of D&D to play with my view of hit points. It worked well enough and the feel of the game was right. I really don't need or really want anything more in the healing department.
For whatever reason, it seems my exact approach is inconceivable to the devs as an option that many might want.
Another thing about 5e. There are not that many features that send me soaring. I do really like big feats and the option to opt out with a passive +2 to attribute. That is the one innovation I consider great. Most everything else is just okay. I could accept most of it but its not really better than the counterpart in 3e. I do like the emphasis on rulings not rules or DM empowerment but almost any old school game will give you that.
For me it's a rare case anyway where good things can overcome something really bad in a game. The entire philosophy of fast healing is like a poison pill in an otherwise decent game.
Note thats all my opinion value judgment wise and purely my own.
I'm sorry, but, good grief. How much hand holding do you expect? You admit that you had to make changes in earlier edition D&D to match your play style. You could do it fine, but, certainly not out of the box in any edition of the game. They are giving you a mechanical framework that SPECIFICALLY answers all of your play style goals - HP as % meat, slow healing, a way to use second wind mechanics that don't directly interact with wounds, and you're still saying that your point of view isn't supported?
Let me get this straight. You want bog standard HP, which you will then interpret as a % of meat, meaning that second wind cannot heal characters (since that wouldn't really make sense - the whole "wounds closing through grit" issue) and you insist that this MUST be a specific option in the game, no substitutions are possible, before you will play 5e. And because the devs are not providing your specific option, the dev's are the ones firing you as a customer. Is this accurate?
At this point, I'm done. There is absolutely no way that you will ever be satisfied. Because even if they did pick this one option and give you, word for word, what you claim you want, you'd simply pick something else to be bothered about. They are giving you mechanics that 100% support EXACTLY what you claim you want, but, because it's not done in the exact way that you want it, the devs are apparently clueless. Yeah, that's enough of that.