On paper, yes: 822 litres against 543.
But the Model Y’s boot sits behind a high loading edge, under a sloping rear window. The ID.4 opens lower, with a flatter floor. A pushchair is easier to load, and reviewers consistently call the ID.4 the more practical family car.
The salesperson who has that reframe ready wins the deal. The one who does not has two choices: agree with the buyer, or discount the car. Both lose money.

