I think your quote sums up the intention of this article and most of the "don't do this" posts. What they all are getting at I think is that constructs in a la

I think your quote sums up the intention of this article and most of the "don't do this" posts. What they all are getting at I think is that constructs in a language can be "abused" or used less than effectively either in terms of processing efficiency or user/programmer interaction. So when they say "don't do this" it's more to show cases where doing whatever "this" is can be bad. Not that it's always bad and should never be used. Also, the "don't do this" mentality can be a useful exercise to teach yourself alternative ways of getting things done.