[derangedHorse]

"sending the response to the token endpoint" Which response?

"makes the system unusable due to the frequency of network transmission errors that would result in having to contact the resource owner" What kind of network transmission errors are you getting? And at what quantity? This shouldn't be too difficult to do

I disagree and think refresh_token expirations do add to security and believe it is the client's job to handle any difficulties that can come with the expiration period