A couple of my friends love that Ed Miller book. Poker is always changing and evolving and it's important to keep up with the times. Probably easier to implement newer strategies while playing live and you can see the person and see what generation they are actually from. Personally, I don't think good poker books
lose their relevancy, however it is reasonable to assume that certain trends have changed. But just like anything else poker is bound to come full circle. You have to find your own style and what's comfortable for you. The most important thing is to adjust to others playing styles and react accordingly; this only happens through arduous hours and hours put in at the table.