Sure, but note the sales pitch was to encourage resiliency through diversity. While that may not be helpful in cases where one vendor may push the same breaking change through to multiple platforms, it also may be helpful. I remember doing some work with a mathematics package under Solaris while in university, while my peers were using the same package under Windows. Both had the same issue, but the behaviour was different. Under Solaris, it was possible to diagnose since the application crashed with useful diagnostic information. Under Windows, it was impossible to diagnose since it took out the operating system and (because of that) it was unable to provide diagnostic information. (It's worth noting that I've seen the opposite happen as well, so this isn't meant to belittle Windows.)
Yes, I already heard one manager at my company today say they're getting a mac for their next computer. That's great, the whole management team shouldn't be on Windows. The engineering team is already pretty diversified between mac, windows, and linux. The next one might take down all 3 but at least we tried to diversify the risk.
