Operability is not something which can be ‘bolted on’ or retrofitted to software after it goes live; we need to design and build our software with operability as a first-class concern. You don’t build a bridge, then try to add load-bearing capabilities at the end of the project — but most software projects try to do exactly that, typically with costly results.
Ultimately, the product owner should be responsible for ensuring that operational requirements are prioritized alongside end-user features. If you are responsible for the software product or service, there is only one answer to the question
Who Owns My Operability?
Update: the site now shows selected recommended reading on each page load.
(With a nod to whoownsmyavailability.com)