[lxe]

> you don't see bakers, mechanics, dentists, accountants writing things like this...

There are literally industry publications full of these.

[almostgotcaught]

Yes and you have to be invited to publish in a place. Meaning at least one other person has to believe your opinion is significant........

[JadeNB]

> Yes and you have to be invited to publish in a place. Meaning at least one other person has to believe your opinion is significant........

I don't think that this is true. The vast majority of technical math publications, for example, are reviewed, but not invited. And expository, and even technical, math is widely available in fora without any refereeing process (and consequent lack of guarantee of quality).