Strunk & White is held in too high regard because of its status as the definitive writing style guide in education. Much of it is outdated, or based on the opinions and pet peeves of the writers. Some of it is outright wrong and promotes bad writing in favor of made up grammar rules such as split infinitives.
Without devolving into a discussion of S&W having the word "style" on the front, with "grammar" nowhere to be seen, S&W 4th edition (the one I happen to have to hand) specifically advises that breaking the rule about not splitting infinitives can be good.
