The Vintage pack includes a garage near Ocean Beach and Ultimate includes a Paradise Garage.
So garages exist as owned spaces. What I cannot tell is whether that is a general system with capacity limits, or whether those are two specific locations attached to two specific bundles. If you can build a collection then the theft system has a purpose beyond selling.
coming to this after the showing, if cars have security levels and value and a collector wants specific ones then storage basically has to exist
Every previous game has had garages. The question is not whether, it is how many and how big.
Two named garages attached to two bundles is all that has been confirmed. Nothing establishes a general system or a capacity limit.
Your last sentence is the important part. Without storage, theft is a means of transport and a source of income. With storage, theft becomes collecting, and collecting is a completely different reason to play.
And the Ultimate car collection commission implies collecting is a thing the game thinks about, even if that specific instance is edition content.