I see no problem with published experts writing about their field of expertise on Wikipedia. It's the sort of thing we should very much encourage to boost our credibility.
I agree, but there gray areas. Take, for example, a person who invents and patents a new engine and forms a company to market the desing.
The product isn't established, but recieves some press.
Should this person be prevented from writing a Wikipedia article? (see [[Quasiturbine]])
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