Earlier quoted context omitted.
When in history has interoperability not been a catalyst for innovation? Look at everything people do in browsers now. Or if that's not to your taste, perhaps the era of BASIC is a better example. Not all standards are good, but a decent standard is better, or at least much more practically useful, than a lot of better but incompatible proprietary equivalents. Of course it doesn't have to be mandated, and in the past…
When in history has interoperability not been a catalyst for innovation? Most of it, including most of the history of computers. Competition almost always breeds innovation. It's basic economics, and why people get upset by monopolies and such.
Different conditions beget different types of innovation. Interoperable systems evolved things (paradigms, models, languages…) that competing ones couldn't, and the opposite is also true. The world needs both, and probably everything in-between.