I'm well aware of that, sadly. But often, part of "maintaining" a valuable repository of information (especially one that has reached stability and is not seeing ongoing updates) is uploading it to the Archive yourself. The Internet Archive has "trouble" dealing with information in the gigabytes and terabytes (which is why donations to them are valuable) but retrocomputing stuff is not like that.
part of "maintaining" a valuable repository of information... is uploading it to the Archive yourself
The problem is that we're talking about information that started suffering from bitrot before the Internet Archive became a big thing. Or even before the Internet Archive existed. Heck 99.999% of it existed before the internet.
Sure, it would have been great if on May 13, 1996 someone would have uploaded all of the information that there has ever been about the TRS-80 Model 100 to IA, but that didn't happen.
So often in places like HN the answer to flaws is "Well, you should have...," as if that solves the problem, or makes it go away. But it doesn't. It just makes the person writing that look like a jerk who isn't interested in solving problems, but in pointing out the failings of others.