Earlier quoted context omitted.
Then continue the fever dream nightmare that is the car dealership.
Walk into a dealer and say "I will pay that price on the window, but on the condition you won't even try to upsell me in F&I." Aside from a minority of shady dealers, most regular car dealers will smile sweetly and tell you where to sign and who to make out the check to. Tesla just formalizes this by forbidding negotiation. Some people like that. But historically people like to negotiate on big purchases. It's a game…
Every dealership I've been to will nod their head then precede to upsell you in F&I. They'll make sure you don't actually get to F&I until you've been their for 5 hours where you're so tired, hungry, and agitated you just want to gtfo with your car. That's not to mention todays market where every dealer acts like and prices like its a privilege to be able to pay them $50,000+ for a vehicle.