Why was there no 32-bit 6502 or 64-bit 68000?

[liam_on_linux]

[Repurposed from Stack Exchange, here]

The premise in the question is incorrect. There were such chips. The question also fails to allow for the way that the silicon-chip industry developed.

Moore's Law basically said that every 18 months, it was possible to build chips with twice as many transistors for the same amount of money.

The 6502 (1975) is a

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[liam_on_linux]

This one is doing well!

Any and all upvotes to the original answer on StackExchange are gratefully received. ;-) As are any corrections, of course.