Why did daddy GM hat them so much?

Yeah, it did work for a while that way, and it was how domestic brands were built. But now days each brand has to be the low, the middle, and the high market brands at the same time. The introduction of the foreign imports changed everything as that's basically how they were run. It was hard to sell to somebody for ever that a Lincoln was a Lincoln and not a car full of Ford parts with the Lincoln name on it. Still today GM and Chrysler are having a hard time defining what their identity is since they can't jump throw the same 12 designs into 10 different car brands anymore. Ford was pretty smart to tier their vehicles out and create performance models of the Fiestas, Focuses, F150s, and so on and then having Lincolns as primarily luxury vehicles pushed farther away from Fords.

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>then having Lincolns as primarily luxury vehicles pushed farther away from Fords

They're not pushing Lincoln far enough. Most of them are still just rebadged Fords. The Continental is a good start though.