I still don't think you have it here... I refer you to the following link:
https://darko.audio/2016/01/what-the-gosh-darn-heck-is-roon-ready/
The head honchos of Roon tell us in that video what Roon Ready and Roon Certified are.
Having watched that video it still seems to me that Roon Ready means essentially that the device has the appropriate support for the Roon architecture whether it be a Core, Endpoint, or Control Point.
They say that certification means that in their testing the device in question works seamlessly with the other devices in the audio network.
I do think my summary above is reasonable.
Moving on to the recent changes made by Roon I see legal issues.
For a manufacturer a product is not just the individual units sold but the whole project life cycle from initial concept through design, manufacture, support, update, and repair until the product is finally obsolete.
This requires a very large investment.
Roon's policy of allowing a manufacturer to call a device Roon Ready and market it and sell it before certification is clearly designed to allow manufacturers a less bumpy financial route to full certification.
The corollary of this is that many manufacturers would make their investment decision based on the existence of this eased path for their product and without which pathway they might well have considered the product too risky.
For such co-dependence to be possible the law requires that companies act in "good faith" - allowing investments to be made which is vital for a vibrant economy.
I would argue that for Roon to entice manufacturers to invest in becoming Roon Partners and then pull the rug out by unilaterally changing the rules relating to Roon Ready and Roon Certified would not be acting in good faith.
Making units become unsaleable which were designed and manufactured on the basis that they would be saleable would be such a serious breach of good faith that it would almost certainly be actionable.