Yes, there is a reason: 27000 applications and if we follow the tracker, around 80% are going to CPC M.....
Oh by the way, totally unrelated (but maybe interesting), when I sponsored my wife, the medicals were requested in February and she got PPR in June, so this is not immediate as you seem to be thinking
My file was transferred to the LVO a month ago and I haven't received a whiff of information, the application reverted to "application received" and hasn't gone back to "in process". It is what it is and I know it is a long process