"Pete C." wrote:

We're
largely past the point where people worry about not being able to run
their old apps on the new OS / hardware version. That worry largely
abated after we got past the NT compatibility worries years ago.

I don't think so.

Now,
both due to the new market where people are more willing to drop the old
apps,

IT isn't being "willing" when you don't have a choice.

and due to much faster CPUs where the old stuff can be emulated as
fast as it ever ran before, it is possible to introduce significant
architectural changes to improve performance.

jk