Sometimes I am bold and only take my little Fuji X100T to shoot an event. Now I discovered that my favourite RAW converter for Fuji, Photo Ninja, is a source of excellent black & white conversions, much better than those I can later make starting from the color version in photoshop. An iconic example from a long series:
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Why wouldn't you just convert in camera?
I might try that. Usually in camera I let it make a CC = Classic Chrome JPEG. Usually I do not touch the JPEG though and go straight to the RAW. Why? Because in my book I get much more details and thus resolution from the RAW in high ISO. It seems to me the internal RAW converter uses too much noise reduction and irons out the high frequency signals = fine details.
I convert almost everything in camera (X-T2, XP2). I made custom presets for my B&W and shoot those in raw, sometimes in jpeg, they turn out great for me, either way. Sports, I use in camera jpegs, custom STD jpeg. Almost everything I shoot goes unedited except for cropping occasionally. I love the Acros simulations and I tweaked 3 different ones for customs and I have them in q menu. In tough lighting conditions, I will shoot the customs in raw and push or pull the conversion based on histogram, all in camera.