You could have a look at this thread
as some posts in it speak about upgrading.
IMO that very much depends of your system's usage.
For instance a very simple layout (only one partition for / note even a separate /home) fits my needs on a laptop, but I can understand that people maintaining servers with a lot of services prefer to have more partitions, as e.g.stated by Tronayne in this post
. Of course the layout will take in account your space on disks and how many physical storage devices you have.