There was an Amiga 600:
but the last model was the Amiga 1200:
that DID have a 10 key pad...
The chips Amiga engineers had in planning for the next generation had promise but the research money wasn't there.
The ironic part is that many Amiga users were encouraged to move to the Macintosh as being more similar in operation;now they will be moving again.
Standardization has its uses but I like for there to be alternate choices just so the standards don't grow stagnant.