> then hundreds of dollars to service when they break

Can you explain what do you mean by that? It is quite rare to see broken trrs jack on a laptop, at least I have never experienced one, nor on walkman or anything getting heavy plug/unplug use.

I thought it is an issue in reducing the cost to manufacture the case or something.

We've got laptops with modular USB-C ports that solve this effectively perfectly. An audio one would be even simpler. The only reason you don't see it everywhere is because they're being outrageously hostile to repairs, and choosing to charge you hundreds of dollars for repairs on a part that they know is easily broken.