Interesting article. From an experienced user standpoint, this would be common-sense. You can't really blame Acorn, third-party manufacturers built such hard-drives. In any case, time has moved on, today's systems dissipate heat in a much better way. DR has a point - how can one fan remove all the heat from such a bloated system?
You can't think of everything when futureproofing a machine, such as global warming!
One other factor is how over the years, dust and filth build up in various locations inside the machine, which can also lead to overheating.