“So if you look at a part on a console that’s maybe one, or two dollars and you say, ‘okay, how big of a deal is that inside of a console?’” said Spencer.

“That’s a few hundred dollars. But then you say, ‘okay, we’re going to plan to sell, you know, 100 million of these consoles.’

So you take two bucks over 100 million now you’re $200 million over the life of the program.
https://gamingbolt.com/xbox-series-x-wont-have-an-optical-audio-port-because-of-space-and-cost