I had all three of those registry settings in LTSR 2203 to fix disconnected/freezing/etc. sessions. The update to LTSR 2203 CU3 removed the "EnforceUserPolicyEvaluationSuccess" entry, but everything continued to work so I did not add it back. We have since upgraded in place to LTSR 2402 CU1/CU2, and the two other registry entries remain to this day. I have not dared to remove them.