Please answer? Is this normal or am I missing something?
You can create and save your own workspace layouts and have as many as you want.
The pre-defined ones were just taking up space and, I'm guessing here but, once most users figure out they can make and save their own custom workspace, those default ones probably don't get used much anymore (I know it was that way for me a while back).
Because Adobe has figured, based on the behaviors of countless users, that only two are ever needed.
Next year, they plan to introduce Dremweaver CC with one. Because you only ever really need one. They'll choose the most popular from the two from this year.
Why would you ever need more?
(Please pardon the sarcasm.)