There is no carving detail. Bodybuilding is about having nice shape and proportions, as much muscle as you want, and low bodyfat. The shape thing is basically all genetics. If you choose a nice assortment of exercises that develop the entire body, you'll almost certainly be about 90% or better - all you have to do is keep an eye out and focus on weak points or whatever every now and then. There is no carving detail - details is about having a lot of muscle (training) and low bodyfat (diet).
Powerlifting is about 1RM performance and that has a heavily neural component. It's not that very heavy weights are bad for hypertrophy - it's just that you can't do enough of it. But do not think that neural components cannot work synergistically to facilitate hypertrophy (this is the whole reason behind the infamous newbie gains). And in PL out of necessity there is higher rep work with more mechanical load because they can't only do 1RM stuff.
Hypertrophy is all about expanding the capacity of the body's musculature. This is why so many BBers make the switch to WSB or another dedicated strength program (well beyond 5x5) and experience much better gains. The reason is that, even though they aren't dedicated hypertrophy programs, they get the #1 hypertrophy thing very very right - get stronger at big lifts progressively. This is where the BBer fufu shit breaks down because so many people are doing all kinds of speciality work when the main goal in their head is to purely get big (granted some just want to refine what they have and get everything in 100% proportion - or do what they are able to with their genetics anyway).
You don't get bigger without getting stronger (a bigger muscle is a stronger muscle - it is adaptation to increased loads so obviously you need to focus on getting stronger albeit not necessarily 1RM but certainly 5RM or 5x5 or 10RM or 8RM or whatever). You can get stronger without getting bigger. Increase weights in big lifts and eat - this is all you need to build muscle over your whole frame. Everything else is minutia.
I think you need to look at these pictures to better understand that training is training. There is no special BBer training. It's all very much the same the same ballpark. Some guys want to hit home runs while others want to look pretty running bases in their thongs, both must learn to bat and hit the consistently or they will be sitting in the dugout.
http://www.midwestbarbell.com/totalelite/index.php?showtopic=1110
So it's not about 5x5 vs. something else. I'm just not sure you are understanding the hypertrophy mechanism and that bodybuilding is basically strength training (albeit not 1RM focus) with a diet component.