This is not true. You "might" not get warranty repair for software problems. If you brick your device because you don't know what you what you're doing... Do you really expect them to fix it any way?
Knox tripped or not, you will still have warranty service for hard ware related defects. Most common problems are physical buttons going bad, defective screen, etc.
Development on this device is fine, it's an expensive tab, not a ton of people have it. When the US let version comes out, my bet is you will see a lot more development
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I don't know, compadre, this is a really slow start. I'm thinking that I may have bought into a flop device and that most people will be going for the PRO line.
I've also never had to warranty out any of my Sammy devices, of which I've had many. I did have to RMA my Note 10.1 due to superbrick - emmc bug though, it was so knackered they didn't even care to check the flash counter. Glad I got the new one from BB, pretty sure they wont know how or be inclined to check the Knox bit.
There is very little risk in solely rooting and installing a custom recovery, unless there is something like the aforementioned emmc bug. Voiding the manufacturer's warranty should be of little consequence and more of a forgone conclusion when modifying your device. You break it, you buy it. Everyone who mods their device, especially from the kernel down, should know and accept that responsibility.