I read the book 10 years ago and it was hugely inspirational to me. From what I remember it was not about drop-shipping or specific tactics (it does mention virtual assistants), but general ways of thinking, like the 80/20 rule. For me, he really pioneered the idea of "the side project" as a thing people were doing seriously, and gave many examples of different businesses people started on their spare time that lead to a full time income. So Tim Ferriss is not a "get rich quick guru". The 80/20 rule, outsourcing things you're not good at, will always be relevant, and that's why his books/podcasts are so successful.

Drop shipping and similar high-margin ventures work when there’s no competition. There’s no reason why it wouldn’t work in the beginning but eventually competition appears and margins go down as the market readjusts.