A newer engine would get rid of chests hidden into the ground for storing NPC’s items.

I mean, this is an obviously laughable example but you can be sure that other quirks of the engine are holding back creativity and performance.

What is your point exactly ?

Pure copium right there.

Apple makes 3nm CPUs but hasn’t tackled the challenge of turning off charging when the battery is full.

What would be the purpose of swapping ?

It wouldn’t automagically reuse the resources used to build the Tesla car into another one.