Yes and no. If you're buying a managed service - like Azure HDinsight say - why do you care or even need to know what's under it? The volume buyers of CPUs now are the big cloud operators. If you're buying a tablet and consuming "apps", then why do you care about compatibility with old Windows desktop applications?

Because you operate some piece of enterprise software that was built in the 90s and is working just fine up until now.

Average end-users (and to a certain degree cloud customers) aren't that picky about backwards compatibility, but enterprise customers certainly are.