I think you're misunderstanding Luuk.
Look:
Right now the guests exit the cars, and after they are out of the exit gates of the station, then the entrance gates open and the people walk to the cars
What we are asking for is that when they exit the CARS, the entrance gates will open and the new passengers will get inside the cars.
No I perfectly understand really fine.
BUT:
Then there still would be an restraints & safety check (never has been in the game because it takes animation and in-game time).
So to compensate that they removed the boarding and unboarding of the train animation (they now just magically teleport from A to B over a distance of 1 mtr.
IF these would be in the game then it would be perfectly fine because the animations would take in that time. To still make sure it costs time they opted for the current used options. No animations. Just spawning in and out of the car. THEN they walk this tiny bit but then you don't need to fit in any other animations which would also take time.
Edit: That's why they said that placing the entrance and exit on the right place is so important to minimize delay.
For example the Barghest, which is based on a Gerstlauer Eurofighter. With good entrance and exits and a good block brake system you can depart a train within 20 (!) seconds. That's more than in real life because moving in and out and stashing you valuables takes just as much time.
If you ask a dev why they won't change it I bet he would give you almost the same answer....