You're reasoning does not stand with me... The Titanium Powerbook came out first. When it came out, there was no Al-book.
People who owned the Ti-books mostly called them tie-books.. I had one.. I knew about 50 people who had them, no one called them T I books.
I find it interesting that people so easily get into such heated arguments over something that does not really matter or make a difference, and where there is not necessarily any right answer.
When it comes to actually discussing things that are difficult to understand and where there are complex naunces, people will often avoid those topics so as to not get caught being wrong.
Really though, why would someone calling the Titanium Powerbook (really it was just a "Powerbook" officially) mean that we had to call the Aluminum Powerbook or Macbook an Al book. No one is holding a gun to anyone's head here.. There is no right answer.. When people ask me what I have, I say I have a "seventeen inch powerbook and a macbook pro"