I constantly hear that the reason an exploit is tough to find is because people don't want to set off the Knox. If Knox is tripped, would the phone still work? I'm sure I'm not the only one who is fine with voiding warranty if it means we can get rid of all this bloatware
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If you "trip" knox in the sense that you're talking about, by flashing anything that isn't the official att firmware, your phone won't boot. (bootloader lock)
I believe there's a counter that gets tripped when you successfully flash a custom rom so samsung can tell if your warranty is void or not, this isn't what the issue with finding root is however, it's the first part.
Also, the reason why it's so difficult to find an exploit is because att/verizon pay samsung and samsung pays various other parties, likely a lot more than $12,000 (the bounty), to ensure that said exploits are not found and that the device will remain locked.
I don't know why att doesn't offer an unlock service for like 100$ they would make an absolute killing.