I agree, but only partially, one can give advice on something that you haven't experienced yourself, simply because you have enough experience in other domains, that you can transfer and still be trustworthy.
However, way too many people indeed talk without walking their own talk, or as you say it, never tasted the food they're serving...
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I agree with you on a certain level.. You can give broader advice that you've cultivated from other areas, but I think it's important to add the caveat that the advice is generalized and pulled from another domain and may or may not play out accordingly to the domain you're giving advice on.
You make a good point though --> many lessons translate from wide array of domains!
True, I can totally agree on that! ;-)