Not sure what you are getting at here? You seemed to have stated what is generally regarded as good practice. Are you trying to get a thread going along the lines of "Which is better, a buouyancy aid, or a lifejacket?" That should produce some debate!
Personally I use my sea kayaking buouyancy aid as it has lots of pockets for useful bits, snacks etc. It also has a detachable pouch (like a fanny pack for our American friends!!), which I can fit two or three flares in for when I am going on longer trips. It is also comfortable to wear, and I float when I am in it in the sea!

Chris