Why would you need a methane gas detector?

I'm an old fashioned bloke who likes to do things the old fashioned way. That's why I'm wondering why a methane gas detector would be necessary? I mean I can fully understand it if you are someone that has lost the sense of smell, but for those with working noses surely it's a no brainer. What do methane gas detectors that your nose can't? If it smells like someone has cut the cheese, then it's probably methane buddy.

I can't write about methane without posting a video of good ol' Mr Methane. So here he is...

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