If someone says, "I'm tired of dealing with X in Y," or, "I can't figure out how to do A in B," it may be appropriate to say Z or C will help. As for outright advocacy, it is poison. In the best case, it's adding a lot of noise for people who are trying to make a decision. In the worse case, it's forcing people in the other direction. There's a lot of reasons why it may be forcing people in the other direction. The article's author mentions exclusionary language/tone. In other cases advocacy diminishes the credibility of the message (e.g. they distort how good their choice is or how bad the alternative is). Plus, some people simply don't want to be associated with that type of culture.