The diving I do and don't do likely will never require an smb, so it's a moot point anyway.
It's not moot.
OP asked a question.
Honestly, it is an important skill for many of us and for the novice diver who has to shoot one, it is stressful and difficult.
It's only a moot point if;
a) you don't consider the original poster's desire for improving valid
AND
b) you intend to do the diving you do now for the rest of your life, don't plan on ever traveling to other world diving localities where a SMB might be neccessary, and stick with narrow horizons.