I'm mostly rubbish with B&W, both because I think it needs a different eye for composition, but also in getting the levels right in any tweaks. I think often B&W needs playing around with on the contrast front to make shapes & tones more obvious, but WoW also does some lovely soft ones when doing misty woodland scenes. So what do I know?
B&W is a good aid to composition, if your camera can display B&W, as it removes the distraction of colour so you concentrate on shapes and texture. Something like that, I saw it on YT and found that it works even if ultimately using colour. Most effective when being slow and deliberate, not so good for sports. 😂