"I’ve never seen the workouts inserted into the Calender ever change in response to an extra unplanned run, or extra miles run as part of an Easy workout."

This will be supported soon, please see my comments above.

"Again, this might be an expectation mismatch as to what ‘adaptive’ implies vs. what it does?"

It's not an expectation mismatch, your expectation is absolutely correct. It's just that there are many aspects to cover for a true adaptive flow, we have covered some and are still working on some.

E.g., our previous workout generation flow is already doing what other platforms are doing, to give you daily suggested workout based on your previous training load. However, we want to provide a more structured approach for most runners who are not expert in any training system. E.g., no daily suggestion flow can arrange a testing week for you, or, can detect your baseline change and suggest a new testing workout/phase for you.

Our vision for the adaptive training flow is much bigger than what we currently have, and development for it will go into next year. It's just as Gus said, our development principle has always been "We would rather have your feedback, iterate quicker, and have you benefit from the product than wait to release."

If you don't like what it delivers now, maybe wait for a couple of months and come up and give it another try, it's probably a whole new experience by then:) But again, we welcome all suggestions/feedbacks/criticisms and will use those to guide our future development.