I like the color. The Expedition is a nice vehicle (we have a 2019).
Did you track the MPG on the test ride of the Ex vs the Lincoln? Since it is the same engine, I'm surprised that the actual MPG would be significantly different between the two? FWIW, Fuelly shows them to be basically the same.
Anyway, I'm sure your wife will like it. I have two complaints about ours. One, towing our 7000 pound boat, the engine and tranny temps still get much higher than I like towing over the mountains. It is better than the Yukon it replaced, but still goes over 240*. Second complaint is we got the XLT with with the 202A (?) package, and it just isn't as nice of an interior as I would have liked. You solved that second problem buying the Platinum.