That wasn’t intended to be marked as “IMPORTANT” and will be corrected. 

Once a Domain is created and has been assigned its Primary Path, we will no longer rename the path when you rename the domain. The introduction of the Secondary Path, which allows older mail data for a domain to be automatically moved behind the scenes to slower and more cost-effective media, is one of the reasons.  The ability for SmarterMail to be used on additional OS's, File Systems, and Storage Solutions, which can often perform certain file functions differently, is another reason.  

Domain Renames are not common, but when they are done, system administrators don’t want us involved in the process and often are doing more than just renaming the domain.   It was a request from customers, which timed well with new functionality in SmarterMail.  

Lastly, we will be releasing a major release to SmarterMail, which also requires this change.  We will be sending out some announcements in a couple of weeks and should have this major release out in a month.