A garage is not just a menu that spawns cars. On a live server it is a persistence system. The non-negotiables are: vehicles keep their mods, fuel, plate, and damage when stored and retrieved, ownership is checked against your framework so players cannot pull cars they do not own, and the database does not bloat or desync after a restart.
The second tier is what separates a hobby script from a server-grade one: public, private, job, gang, and house garages, a real impound flow, and protection against the two bugs that ruin garages at scale, which are vehicle duplication and spawn pileup when many players retrieve at once. Anything that fails the first tier is disqualifying no matter how nice the UI looks.