I don't think Dan said it is a bad idea. He suggested some alternatives, which may work better for trainees who alredy did a few simple 5x5 cycles. I don't think that anyone who hasn't tried the basic 5x5 should immediately jump to advanced variants. Also, if someone is progressing with basic 5x5 protocol, why change it after 2-3 months if it still works?
Particulary interesting version of 5x5 workout is Glenn Pendlay's, which you can find on the Internet as "8 week squat program". It was also posted here some time ago.