Look how long we're still dealing with software that requires Java 6/7/8, and all the security issues that come with that. Servers/Appliances with IPMI remote consoles that do not support HTML5. It's easy to say "Replace the equipment" but our budgets don't always allow for that.
I think Microsoft's commitment to backwards compatibility is awesome. But it would still be better to at least get newer apps working the right way. Even in the event those legacy apps remain in use for ~forever, at least there would be fewer of them.
