LT training is definitely overrated, and lots of successful athletes rarely do Daniels-style LT work.
But Seiler's research is garbage. He basically looked at the training of elite athletes, made some gross generalizations, and then said that those generalizations are the law of training. All nuance was obliterated. No differentiation between athletes at different stages of development, event specificity, periodization, muscle fiber distribution, injury history, training history, etc. Basically his training laws are a lay person's description of what highly expert people are doing, without any use of their actual expertise. It's sort of like if I went to the symphony for the last several years, all over the country, I then started hosting lectures telling people that the previously unknown secret to being a top violinist is wearing tails. I agree with the premise that what the best athletes are doing is likely to be fairly close to optimal, but to find out what they're doing, I would ASK them to explain it.