I feel like this hyperbolic leap in your reply to Jay R was atypical of your norm Tanarii.
Edit: Perhaps my later reply to Jay R helped?
The following is ignoring the hyperbole in your leap.
Beware Sample size of 1:
A: 4E's lack of sufficient multiclassing was one of my main reasons I skipped it. My other dealbreaker also dealt with other aspects of the decreased volume of mechanical representation for character concepts.
B: With level by level multiclassing the volume of mechanical representation for character concepts does scale fairly well with increased number of classes. That contributed to why I bought so many 3E books.