Interchangeability has afforded us many advantages. Like you noted:

Imagine what it would be like if there wasn't anything like interchangeability and just the bearing of a car spoils and you have to buy a new car?

This is really a solid point.

I remember during my industrial training, we replaced series of car components daily and the customers go back home with smiles on their face. Thanks to interchangeability.

Well done.