Not so strange if you look from the persepctive that belt armor is a RELIABILITY upgrade (not really an armor upgrade) and Orks are not supposed to be reliable.
Orks should change the hull upgrade into soemthign with more hull than other races. They shoudlnot be reliable but should take loooong to go down.
Their needs to be a point where you need to step away from lore for the sake of balance, you cannot design a faction to be inherently unreliable and the expect that faction to be competetive vs those that are consistent preformance.
unreliability is one of the major reasons that lotsa gunz are so bad with its any where from 2 -6 shots and why kannonz are prefered because of their much more consistent dps
People don't want to rely on randumb chance, cause at that point your relying more on luck than your skill as a player
If the devs are willing to break from TT and lore on other instances, the then they should do so here as well