I believe Neo is correct on this, and I think its an excellent idea. As many members are constantly creating multiple accounts, and a few people only to hand off reins of a Coven amongst themselves. This ideal proves to be a huge hindrance for many reasons, when Coven creation was available a couple factors were looked at such as the substance of which a new Coven was suggested and whether or not the person presenting said Coven was eligible to become a Priest or Priestess. Meaning if you Coven ended up deleted or Admin had to remove you as P/P you were no longer eligible.
Also I understand that some decide to run a Coven completely on their own. which I can not say I am for or against though it creates the possibility of a few unwanted scenarios. Say a member has made P/P out of two of their own accounts, and they become absent for long periods of time, or get gagged on both, or even worse become a GOS. This causes huge problems within a Coven causing it to become dormant, and due to that the members of the Coven suffer a great loss.
These positions are designed the way they are for great reason, and adding this 2-3 month period ensures that some of what we all have witnessed on this site in the past year does happen anymore. Personally I think this should have been done a long while back. But when you are busy dealing with the throes of an entire community better late than never.