A few things I would change about my garage if the world was perfect…
Make it bigger. At 28 x 40 it’s still too small. Always seems like I could use a couple extra feet in all directions.
Floor drains and the correct pitch to the floor. If you are going to park cars account for drainage from snow and slush in the winter. Mine doesn’t have drains and the floor is sloped to one of the walls. When it snows, I get to squeegee the floor every day for a week.
Water. I would run water to a sink so I could wash my hands before coming into the house.
More juice. I only have 50 amp service.
Additional garage door on the back to have better access to my back yard.
More outlets. I wired an outlet about every 8 feet, plus a half dozen on the ceiling. Still not enough.
I guess that’s the list and it turns out to be more than a couple things.