I’ve worked in data centers. The constant air circulation causes dust to accumulate in visible places. I assure you, computers are not as sealed up and tidy as you’d think. We used to jokingly call the hard, thick, black dust “cancer”. It’s hard to know what’s in it without study, but when you manufacture something with dangerous materials some amount of that material makes it onto and into the finished product. I’m not advocating for alarm, but your po-pi-ing comment was designed to minimize and it demands counterpoint.