obobskivich
Headphoneus Supremus
Wow lots of info!! Well Coming from the sim racing side of things, a lot of high end wheels and pedal sets suffer from a lot of noise in computers.... I have a feeling most don't really know where it comes from, but it seems many seem to calm it down by taking some extreme grounding measures with their usb connections, often tapping into the USB and grounding it to a copper pole shoved 10 ft into the ground. What is the cause of this? I don't know. But what it tells me is that a computer is a very messy and electrical noisy place. Of course i can be very wrong. I dunno. Electronics are NOT my thing.
Frankly I'm not sure what you're specifically talking about here (like, how would an interface peripheral "suffer from noise" and what would that look like, symptomatically?), but I can tell you the whole "computers is so messy make your sound so bad can't even listen its like nails on a chalkboard you gotta buy the Gobblesnort XXXL BBQ 9000 external interface nothing else will cure your problems" thing is a myth that's been floating around for a few years, and is generally always perpetuated by companies that want to sell USB audio solutions.
Historically, built-in audio (as in, the audio chipset built-in to your motherboard) has had issues with noise ingress from peripherals or internal hardware (like hard drives) but this is generally caused by manufacturing issues (read: the people who designed and built it went cheap and did a half***ed job putting it together) that lets the ground on the analog audio interact with grounds for other devices. This does not mean, however, that the "inside of the computer is an unusable mess" - there are plenty of internal cards that will post up near-flawless (as in, well past audibly transparent) numbers, and many professional audio interfaces are "internal" specifically because USB (and many other external interfaces) can't offer the bandwidth or latency performance needed to make things work. I guess you could summarize this as "cheap stuff is always cheap" but that doesn't sell new hardware...
Really good historical example, Apple took an absolute beating with the PowerPC G4 Power Macs and their onboard audio's noise, but they're absolutely fine with a dedicated soundcard installed in one of their PCI slots. If you're a marketing company though its really easy to go "hear that noise? that noise is because its INSIDE THE COMPUTER, WHICH IS LIKE MORDOR FOR YOUR ELECTRONICS, NOTHING CAN SURVIVE IN THERE, ITS SO BAD!!! YOU NEED OUR NEW PRODUCT THAT FIXES THIS BY BEING EXTERNAL!" and of course it will "fix" the issue - its bypassing the problematic connection. But the reason WHY it fixes the problem is just marketing bunko.