Probably because we want to know more about our favorite faction that isn't about how the space marines win to us one on one.
The only thing we need to know is If you're a Blood Axe: How can you be more sneaky and cunning?! If you're an Evil Sun: how can you build the biggest war machines and how much faster you can go?! If you're a Death Skull: How can you steal and loot anything from anyone?! If you're a Bad Moon: How much more can you flaunt your wealth and show off your flashy kit?! If you're a Goff: How many more heads can you cave-in or limps can you lop off?! That's all we need to know!
I believe the answer to your myriad questions is 'MORE DAKKA!' Possibly the Goffs might prefer 'MORE CHOPPA!'
I dabbled in fan-lore a few years ago, and wrote about one Ork Kaptin who'd become addicted to making space craft explode, so much so that he almost totally gave up personally fighting to direct the gunz and watch stuff blow up. He'd grown so fat from remaining on his command deck that his second in command thought his Kaptin's chair was "wide enough to park a Stompa."
