I haven't seen it anywhere else and usually it's not a problem, as flows are generally quite "slow", but can we get support for Azure AD registered apps, e.g. runs with the "AppOnly" token rather than a username/password?
This has a number of advantages:
Gets away from using user accounts which die when they leave, of having to update passwords, etc.
Stops orgs from using service accounts.
Reduces the impact of throttling (though we may have to ask for "decorating" support as well to fully achieve that).
Potentially stops content being "modified by" that pesky user/service account.