I don't know which article you read, but the one I'm referring to had a person in a professional capacity, as representative of their company, at a conference.

I don't know which article you read, but the one I'm referring to had a person in a professional capacity, as representative of their company, at a conference. If you are a spokesperson for a company - and that's what Evangelists are - then, while you're at a professional event, your words should reflect the stance of your company, not your own. That's what you get paid for. I wouldn't consider this a firing offense (unless it's not the first time), but I wouldn't consider it a career enhancing move either.