Much of the expertise on the platform has been slowly internalized by IBM over the years. The experts on the platform work for them. Example. I used to work at

Much of the expertise on the platform has been slowly internalized by IBM over the years. The experts on the platform work for them. Example. I used to work at a massive organization that did have some core applications on mainframes. The guys who maintained it retired and they couldn't find anyone to fill the position. So they contracted with IBM to maintain the system. Guess who showed up on site wearing IBM polos? The guys who just retired. Now doing the same job but making even more while doing it.