Red Sage
The Cybernetic Samurai
Yadda, yadda, yadda, and a big fat 'DUH'... I could point to plenty of vehicles in the existing list that I would ordinarily remove. However...The Alfa Giulia and Jaguar XE are direct Model 3 competitors.
The rest are large or larger cars.
The Acura RLX is a tenth inch larger than Model S.
Even though Lincoln MKZ is based on the "midsize" Fusion it is within two inches of Model S.
The Cadillac CT6 is a whopping 204"(8" longer than Model S) long and has a base price of $54k. Cadillac's compact, ATS, and midsize car,CTS, are properly represented on the list.
When I asked for clarification, @RubberToe replied with, "...vehicles chosen are deemed to be in the rough MSRP range of the Model 3."
Per the EPA, the Cadillac ATS is indeed Compact -- just as are the A4, 3-Series, and C-Class. I am certain the EPA will put the Model ☰ in the Midsize class by usable volume for passengers and luggage, which I expect to be over the 110 ft³ threshold for the car. The Infiniti Q50 and Alfa Romeo Giulia are both Midsize cars too, but will undoubtedly be direct competitors to Model ☰. The Lincoln MKZ is similarly classified as Midsize (115 ft³ total). Guess what? So is the Acura RLX -- Midsize at a combined interior volume of 117 ft³. The BMW 5-Series and Mercedes-Benz E-Class each are classified as Midsize. Heck, the Lexus LS is Midsize (117 ft³) -- and even when you order the extended wheelbase 'L' version it is still Midsize. This official EPA size classification has NOTHING to do with the LENGTH of a car.
Thus...? If German cars that have a starting price over $50,000 can be included, then surely American cars at the same price point can be considered as potential 'competitors' for cross shoppers to peruse. Large cars are at 120 ft³ or larger in combined interior volume. The rear wheel drive Cadillac CT6 starts at $53,795. The front wheel drive Cadillac XTS starts at $45,595 -- $400 less than the Cadillac CTS that is already on the list. And the Chrysler 300 has a current starting price of $32,340 per their website, with trim levels ranging up to $42,770 -- thus within the range of the Model ☰ MSRP -- since it will start at $35,000 and Elon Musk said he expects the Average Sale Price to be $42,000.
So, for the purpose of comparing cars within the proposed (admittedly rather wide) price range of the Model ☰, these cars are all perfectly fine for the exercise at hand.