I agree with much of that though I've never been an ork player.
1. Agreed. Random tables are stupid for almost everything. They make sense for mid game chaos mutations, but that's about it.
2. Yeah, the challenge mechanic has always been open to abuse and much irritation.
3. I'm not a fan of flyers in 40k. Thru should have stayed out.
4. I don't mind the rulebook actually. I think they could do a better job writing the actual rules language, but the current rulebook is probably the best one they've ever made. The fact that there's an index is amazing. Imagine playing 40k worth no index! I remember those days.
5. Multiple books . . . Hmm. I think this par for the course. Games companies make books and sell them. That's pretty normal. To do it differently would mean either rewriting everything all at once and release books in a set order, all at once, OR maybe make the game content some sort of subscription (paid or with the purchase of models) and accessible via Web app.
I'm personally a fan of a Web app. It allows the status of the game to be tweaked and rebalanced as and when needed. Requiring a mobile device / computer to accesses it might present a barrier for some users though. I generally think the advantages outweigh the problems though. Having a system whose points are always balanced and who never had power creep would be amazing.
Rolling a ton of dice isn't a problem if the rolls are all clear. If you need to roll 5 times per model though, that's a problem. And in general I was a fan of the warzone system (roll to hit, roll to save, remove dead guys, done.)