I hear a lot of athletes and coaches spouting out their knowledge about training, using complex terms, or creating complicated workouts. It really doesn't need to be complicated to be successful though. If I put a list of the most important things, complicated or super-scientific training isn't listed anywhere near the top.
Things that are near the top? Consistency first, then injury prevention, recovery, diet, sleep, and progression of training load are just a few I would rank near the top, or at least well ahead of the complexity of training. I have seen plenty of athletes train in ways which go against common exercise science, but because they are consistent, and do many of these other things, are still able to do fairly well and improve.
If you're going for an Ironman World Championship, Olympic Gold Medal, or ITU WTS Championship, you need to really look at the science behind every decision you make in training and recovery. But that's a very limited group of athletes and coaches, who can control many other variables in their lives, (not having to balance a job, full-time focus on training and recovery), so it doesn't apply to most athletes.
Keep the training simple, and be consistent. Stop making it complicated, and you'll likely be successful if you are consistent in executing it.