Very nice car! I like the clean overall styling and the interior, but darn; those American 80's-era dashboards still look pretty cheap, and this one's supposed to be walnut.
You mention an Eldorado Biarritz... why was it called that; it wasn't a convertible, was it?
Lastly, if "these new offerings seemed just a little too small for Cadillac Motor Division," I wonder what those folks might think of today's monstrous behemoths bearing the Cadillac brand. I myself am revolted by them.
Park one of these next to a 2022 Honda Civic. The Civic will look bigger to the eye although the '86 Seville is actually the larger car in every dimension. The problem wasn't that these cars were too small (they were similar size to contemporary BMW/Mercedes). The problem was they LOOKED small to buyers used to a car with visible size on the outside.