True. Space is at a premium at most Tesla DCs, even though their new strategy for physical infrastructure is to look for cheap real estate and not high end shopping centers.
E.g. they're opening a new Tesla Store in Eatontown Borough, NJ in an old abandoned building that's been vacant for four years. One of the agreements with the town is that it won't look like a car dealership, no giant holding lots, and the demo cars will look like normal customer cars, parked in normal customer parking spots. That was the condition of the zoning waiver, since car sales is technically not allowed at that site by local zoning rules.
That being said, Tesla certainly can lease additional parking garages/lots to hold temporary local inventory, which giving customers some leeway with regard to the three-day-rule. Many car dealers in big cities do this but alas Tesla does not, and some customers suffer for it. Maybe they'll change when demand eventually stabilizes.