I should put this to rest.
Back in the 1970's, IBM made the 5100, but it cost as much as a few new cars so nobody (As in your typical consumer, only companies and rich engineers could afford them) bought any.
Then they made the 5150, which is now known as the IBM PC. Believe it or not, the same person who did all the quality control on the chassis for the IBM PC/XT/AT machines now works at Alliance doing quality control for Speed Queen machines.
Anyway, the IBM PC/XT/AT machines in my mind were some of the best built machines on the planet. A lot of people don't know that the US Government mandated IBM to make these machines Electromagnetic Pulse (EMP) proof, hence the reason why the cases were so well built and designed.
Another problem was that these machines did cost an arm and a leg back in their day, so it made sense they were built with very high quality.
Then the PS/2 series came out in 1986. The PS/2 machines were still fairly high quality machines, but proprietary as all heck and you could certainly see where IBM started cutting costs to stay competitive. Still, I can see the occasional PS/2 machine in the back closet of a bank running OS/2.. which really say something for the longevity of these machines.
Then sometime in the mid 1990's when IBM discontinued the PS/2 series and created the Aptiva series of machines, quality took a nosedive. They cost cut everywhere.
Eventually, IBM gave up and sold their entire PC business to Lenovo in the mid 2000's, Lenovo being a Chinese manufacturer.
Kind of a shame, but the PS/2 was IBM's downfall.. but only because they didn't open source their MCA (Microchannel Architecture), rather they kept it proprietary. That's where Compaq and Dell ended up eating their lunch..
Kind of sad to watch it happen... The worst part is that MCA was just as good if not better than the PCI standard which Intel introduced in 1993. IBM was at least 7 years ahead of everyone else in that regard.