This student makes some excellent points, and it's a bit scary how some things reinforce each other.
Some journals, Nature being the most notable, chase impact factor above all else. The only thing they truly care about is that the papers they publish get cited. This means highly original work, which frequently doesn't get cited much for a long time, is less desirable than a turn-the-crank paper from a respected name.
Researchers have been taught to prize Nature publications (thanks to the same flawed metric of merit) and spend a disproportionate amount of time submitting papers to Nature. When you write a paper you choose your target journal, and writing for Nature means you need to avoid rocking the boat too much, because they receive so many submissions that one minor criticism from a referee will torpedo your paper, even if that criticism is demonstrably wrong. Sometimes invalid criticisms are made by referees who are jealous, threatened, or merely lazy, but the editor has so many other submissions to deal with that he/she won't take the time to evaluate and understand the referee recommendations. Real science invites debate, but Nature's editors run screaming from it.
Why do researchers care so much about playing this game if it compromises their writing and even their research? Even a tenured prof needs to hustle for funding if he wants to do more than teach and sit in his office. PI's are salesmen even more than they're managers! The very language itself is twisted at the core when applying for grants. The average researcher or project must be superlative in every way on paper or no money is going to come. You can't say you're doing something out of pure curiosity and the chances of it spawning another silicon valley are remote. It has to be imminently commercializable with potential for massive, revolutionary impact! Honesty will destroy you. If every research proposal delivered what it promised the World would be one giant Palo Alto. We would all be better off if some better way to allocate resources were found, but that's no easy task!
As for the PhD student... There is more than meets the eye here. You don't walk away from 4 years of work in the last month without reason. Perhaps his thesis is a hopeless mess. Perhaps his relationship with his supervisor is hostile. Perhaps he's mentally ill. The last few months are ridiculously stressful after all! It's also very possible he or she is a lot more than one month from finishing. Hopefully there are people who care about this person and will help him/her get back on track and finish. The game is flawed, but the best way to ensure nobody wins is to refuse to play it.