Default [Q] Any reasons not to update to 4.4.2?

I have just bought a new S4. I have had one before and I like to root my phones. I was hoping that this one would come with 4.2.2 so I could keep it on the old bootloader for a while and be knox-free.

It came with 4.3 preinstalled, so I already have the new bootloader, but I am still on 0x0.

Are there any reasons not to update to 4.4.2 now? Is it possible to root and keep 0x0 on either 4.3 or 4.4.2, or do I have to trip knox to root now? I know that I can't install any custom roms yet without tripping the flag (I think).