There are many, many ways to start, setup and and maintain a reef. I will not say that BBs/wet-dry won't work because with the right amount of maintenance and livestock balance, they can certainly be viable. However, the over-efficiency/effectivness of BBs or them robbing filter feeders and micro-fauna of food supply is not something I would buy into. In fact, without proper cleaning of the BBs every now and then, nutrient concentrations will likely increase in an aquarium. The amount of detritus and waste that is produced in a reef tank far exceeds anything you would typically find in a FW tank where wet drys are mostly used. This is why many people call BBs "nitrate factories". In a reef or FOWLR, live rock is going to be the preferred method of bilogical filtration. It isn't that you are using "less filtration", its the idea that your decoration (rock and sand) are going to do the work and the use of BBs is redundant and even potentially problematic. LR has the ability to provide surface area for mutiple types of bacteria that allow for ammonification, nitrification as well as some denitrification (depends on the quality (porosity) and size of the rock in the aquarium). BB's will definitely now allow for denitrification.
In short, most hobbiests will do everthing they can to keep it simple by using live rock and supplementing that with mechanical filtartion such as filter socks and protein skimmers and carbon that are easily cleaned/replaced to remove nitrates that are not handled via denitrification bateria. Bio-pellet reactors and refugiums (alage) are other options for nitrate and phospate control. Sumps are great for employing all of these practices while wet dry filter (even with BBs removed) are going to limit the space available and are not nearly as modifiable as a wide open tank that can be setup to suit your needs.