One Customer had a hardware failure on a really old SMS2003 server holding Management Point (MP) and Distribution Point (DP) roles.
Since the HW were really old and soon to be terminated I installed MP and DP roles on Primary Server and asked network team to change the DNS record for the broken server to point out the Primary Server.
Even if clients/agents should go to AD and check for the MP role I have seen that many clients need to be restarted before they do and above goes much faster than wait to all 10'000 clients to get restarted.
Just a small tip :)