Can we reopen this question? Originally it presented some arguments for reducing the number of PhD positions offered, and asked, "What's your opinions about this". It's been edited so it's fairly clear what it's asking (Are my arguments valid, What counter-arguments are there), it hasn't been answered in an especially satisfactory way, and it's a valid (and useful) question. (Although it would benefit if it would be more clear who "we" is in the context of the question.)
The linked post isn't a question; it's a persuasive essay. There isn't even much of an attempt to frame it as an objectively addressable question; it's simply an attempt to argue a philosophical viewpoint from one particular angle. While this is a great "letter to the editor" or blog post, I would suggest that this is a perfect example of a question that we aren't looking for on this site.