I know them quite well... I've done some minor dev work on them. But with multi-threading, you get diminishing returns and can't fully max-out all the cores, no matter how much you want to, you'll have some idle CPU time on some cores... increasing amounts as you increase the core count.
Er what? So you should waste processing time on a core to transfer files because in practice you can get the cores to work 100% of the time. Sure, whatever.
A completely specious argument... The overhead of a USB transfer doesn't drag-down a modern CPU. Take just a few dollars of the money you'd pay for Firewire versions of your gear, and use it to get a slightly higher-end CPU. Now the overhead of USB is covered, you've saved some money, and you're better-off all-around.
I gave you the actual real world numbers above. For USB2, the overhead was 90%. USB3 it was about 30%. For the average person surfing the web, USB transfer doesn't drag it down. If you are encoding 1080p (or higher) video using multiple cores, I will tell you that the USB transfer will slow it down.
Take just a few dollars of the money you'd pay for Firewire versions of your gear, and use it to get a slightly higher-end CPU.
A Firewire 400 card is about $20. That is much less than a few hundred dollars for a new CPU.
Firewire is around because of legacy DV cameras. If Firewire was any good, eSATA wouldn't have ever appeared.
Now that's a specious argument. Firewire is OLDER than eSATA. Firewire was the best transfer you could get at the time and the original 400 still beats USB2. Over time standards get replaced. That's like saying if 1080p was any good why are we moving to 4K televisions?
But it's still around mostly because it had several years' head-start on USB3.
You answered your own question and you didn't know it; however, for realtime work I wouldn't use USB3.
Thunderbolt is only a thing because Apple has a dog in the fight, so they insist on forcing it on their users like Firewire before it, or PPC processors before it, or now with H.264 and blocking Flash and WebM, or a million other examples.
Thunderbolt is an Intel spec just like USB. Apple helped develop Thunderbolt and was one of the early adopters. Firewire, at the time, was the best transfer protocol that anyone could use. When Apple put it in their machines(1999), USB2 wasn't even an approved spec yet (December 200). I don't know what you mean by "forcing" users. Users didn't have any other option. It wasn't until years later till USB2 had mass adoption; even then Firewire 400 devices were still clearly better.
No, my argument would be that you've so far been unable to name even ONE single case, where your Toyota Camry has been insufficient for the task.
Hello? Encoding video? Professional video work?