This is not a major deal, but these would be nice to remember - default file type associations and directories.
I don't know of any other reason for verifying the directories. Unless there is new product coming into play, the product and plugin install directories should remain the same. IF there is going to be a complete install, then specifying the install and default directories would make sense to respecify. As far as I have seen, a patch does not really do a full install and specifying something else that what the original install would likely hose up the product/plugin execution.
A patch is a process to update an existing set of code and should use what is default and outlined with the original install.