Someone above said "BFS only gives you an edge over spinning gear if using very very light weights", that is simply false, it’s not as niche as it’s made out to be anymore. One of the biggest fallacies around bfs is that it is just ultralight fishing with baitcasters. There’s no industry standard for rods or lures that defines them as bfs, people just be making up their own definitions. Rod and lure are chosen for your target species/application not by some arbitrary weight range or rod power (within reason obviously). Many bfs spools are rated to 15 grams and more. Another myth being that bfs is trying to replace spinning gear. They have different purposes, (bass) bfs was designed specifically for accuracy, stealth, and power in pressured tight quarter fishing scenarios.
Some real advantages over spinning gear of a casting reel with lighter spool/bearings and line are improvements in ease of casting, lure control, accuracy, sensitivity, line management, and very stealthy lure entries. Also, a nice side benefit is being able to spool up with straight 8 or 10lb fluoro line, try that on your spinning reel! A few disadvantages are a bit of a learning curve, and deep water applications. If that sounds good to you then yes it's worth diving into the rabbit hole.