I have two hypotheses why the conventional IO/competition economics view of #interoperability understates its benefits, perhaps due to slight technological complexity in understanding its potential:
1. Fully interoperable tools can be plugged together in all sorts of unexpected combinations. See eg #Unix or #bridgyfed
2. Interoperability lets a single function (eg auto-translation) be developed once in a single tool, then applied across a range of interoperable services. /1