Default [Q] Need to update?

Hi, i have an s4 and i am still on the 4.3 bootloader. I never officially flashed 4.4.2 tw. I can flash all 4.4.2 roms just fine everything works. So my question is..should i update it? Should i not? What are the downsides and upsides. Also i believe my knox is already tripped and my warranty is gone because i hastily updated to 4.3 from 4.2.2 so yeah if knox is out of the question is there any harm in updating my whole phone to 4.4.2 bootloader/modem etc
Current device: OnePlus One
Current rom: CM 11s


Amazing phone! Loving it!