I didnt say opening theory is useless. What i will say is that spending the majority of your time on openings is a waste. But people are free to spend their time on what they want.
Sorry, mistook you for that other person who said it was a waste of time before whatever arbitrary level he decided was important.
I would wholeheartedly agree with you, but that being said, there really aren't a lot of foolproof ways to improve your calculation other than just playing games and doing puzzles, but I would argue that puzzles aren't really improving your calculation skills as much as they are improving your pattern recognition. Analyzing your games doesn't improve calculation, it improves pattern recognition, board awareness, and recognizing things like weakness and potential tactical opportunities. Calculation is a horsepower thing, and it's hard to train that other than just by practicing.
Obviously if you just sit in a room all day memorizing openings you're not going to get any better than someone at basketball sitting in a room reading about basketball strategy, formations, plays, footwork, watching tape and the like. It helps, though, especially if you can put it into practice.
As a USCF Expert. The vast majority of my games are decided by blunders and tactics.
This is a bad argument. Just because the vast majority of games are decided by blunders and tactics does not mean that theory is useless or even unhelpful. I've never claimed that if you study openings you will automatically win. But if you get to the middle game in a better position because you know theory and your opponent doesn't, then your chances are better. End of story.
What is the old saying? Tactics flow from superior positions?
I didnt say opening theory is useless. What i will say is that spending the majority of your time on openings is a waste. But people are free to spend their time on what they want.
Problem is when most people, especially lower-rated players study openings, the vast majority of them just memorize moves and lines they will see maybe 3% of the times they play, when they should instead be trying to understand what said opening is trying to accomplish, what are the plans, strategies, optimal piece placement, common tactics in the position, reoccurring themes etc