It's extremely important to build a good foundation of strength right at the beginning, even if your goals are purely aesthetic. This is because that foundation of strength will make it much easier to build the mass you want in bodybuilding. If your chest is lagging, it's much easier to build it up if you can bench 300 than if you've never worried about strength and can't bench 200. Much of bodybuilding is trying to fill out the things that genetics have made a bit smaller than everything else, so a bodybuilder would be folly to neglect strength completely.
Add that to the fact the beginners usually aren't ready for the high volume normally asociated with a traditional bodybuilders workout, along with the fact that a beginner doesn't yet know how their body reacts to different types of training, and you'll understand why we say that a good beginners routine works for a number of different goals.
Don't over-think your routine. In golf we call it "paralysis by analysis". Find a good, respected beginner's routine, and give it enough time to do it's thing. You'll learn much more about yourself by sticking to a routine than you will by switching around.