I find it odd how Apple went from expandable SE/SE30's to a Classic 2 with no expansion whatsoever.

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Maybe stupid, but not odd. There's a simple explanation which is adequately documented in many Apple history books. It was a change in Apple's strategy and part of their objective to roll out a line of simple, cheap consumer Macs which could be manufactured very cheaply - the first of these was of course the first Classic. But if you look at Apple's past, they made quite a few crippled machines - so I guess you could just count the Classic II as one of those.