Hey Ned!
Long time no chat... first off... thanks much for this!! It just saved us on an issue we've been chasing where after standing up a new cluster CSC stopped working for Win10 users. I eventually followed breadcrumbs to this blog post and in turn turning off CA definitely solved our issue.
Just one question though. If CA can potentially cause this issue and as you say "When you mark a share as 'continuously available' you are essentially committing to the following contract:", then why not leave the setting off by default? This isn't something we intentionally turned on with the new cluster and don't have plans to use Scale Out, so we only knew to go turn this off after the issues started and we found your blog post.
In any case, thanks again for a very well written article as always sir!