What's for sure is that some of the most celebrated programmers (by management) leave a wake of defects and sloppy work and convince management to adopt horrible platforms.
I haven't paid much attention lately to IBM.
That out of the way, this: historically IBM produced low-defect software. The UIs were often clunky or even bizarre, but the stuff was stable and did as advertised. Meanwhile most newcomers (MS, for example) produced horribly buggy stuff. Not saying revising how they do things wouldn't help, but adopting what everyone else is doing is going to result in... what everyone else is producing. Not a worthwhile goal.