I think it was nice how sometimes in gta4 but more often I think it TBOGT and TLAD the car you drove up to the mission, post cutscene would be parked nicely across the road or some shit. It made me more confident to take my car but it was too inconsistent, you never know when the mission you're going on would lose you the car or let you keep it.
That's the only real problem i had with GTA in the past. It's the reason i never really took my cars out of my garage unless i felt lazy. If they bring back 'Car Modding' in GTA V, i'll probably still not take my cars out of storage all that often because i invested time and money on them. Unless money is in abundance, then i'll be more reckless and just go with the flow.