If your computer functions OK when using those settings then by all means use them. Many users are not so fortunate.
According to the linked article using S3 does shut down everything and holds settings in RAM to restore to the previous state. This doesn't seem to work well for most hardware.
Perhaps OEM computers that may come with the latest hardware that may be fully compliant will work as described. As I stated, if it works for you then use it.
I use a PS/2 mouse and when I have attempted to use S3 settings the mouse would not wake up the system. Seems to be counter to what was suggested in the article.
Another point I would challenge is the amount of current a PSU may draw at idle. That would be an interesting test to run though.
Finally, the article recommends Enabling WOL. I strongly disagree with that idea.