Apllication of component updates

[Frankschtaldt]

You would have to redesign the vehicle in order to take advantage of the modifications.

So from what youve said, the vehicles that are built from the same design after that date wont take advantage of any improvements to the design through the modify button?

I believe that is what he is saying.
This discussion is just reinforcing me feeling that component modification is:
a) Way too expensive
b) needs an overhaul

I never thought of the modify button as something which would cause major enough design changes that would require you to redesign a vehicle.
I was thinking of the manufacturer making changes based on customer and mechanic/technical feedback on the vehicle, like changing a seal, modifying timings etc..

If you can think of an example of where/how this happens in real life and to what part of the vehicle, id be much appreciated. As you can see im having some difficulty following it

I'll give it a go but I'm not 100% sure exactly what you're asking.

Commodore (an Aussie car for you non-Aussies playing along at home) would be a good example of a car undergoing minor changes based off experience learned in the marked and being re-released as a new year model. Ever heard the term "Series II"? This is what Holden does to keep their cars up to date between complete model overhauls. They generally make any necessary changes as one big alteration and put it out as a "Series II" then leave the car mostly alone until the next model.

BMW would be a good example of the opposite. Every time I took my Bimmer into my mechanic with a failed part he's complain about how BMW constantly change things on their cars and it made it hard for him to know which part he needed. This was generally smaller components like oil pumps, powered window winders, fuse boxes etc. The overall car was basically the same through out it's life but but there were constant component upgrades going on under the skin.