BBB is not an alternative to using a SWCG -- many of the Contributing members here have SWCGs.

The term BBB arose from my pages about grocery store chemicals in pools -- bleach, borax and baking soda. But the core of BBB is not using those chemicals, but rather using only what you need, using it in an efficient manner, and avoiding everything unnecessary.

Bleach doesn't have the cost advantage it did 15 years ago when I wrote those pages, but it still has specific advantages. However an SWCG is essentially adding bleach to a pool (plus removing some acid) so the chemistry is quite similar.