It's great that you have fun playing these things, but I think it's important to clarify that they're not really the best way to go for most people.
Who are you to say what's best for most people?
There's no difference between a power gamer giving the max in strength and weapon skill versus a random roll giving the max in both of those, save that the random roll can also max out everything else. The fact that you don't control that means that you can literally power game by accident by rolling a character that is just better than everyone else's.
There is, in one case the player actively chose those stats. The other the character happens to be that good. A player can just as easily accidentally power game with point buy by not knowing the system.
If some characters aren't meant to be equal, then you should assign some of the players to play as NPCs who don't interact with the story at all unless the other players show up and then get killed off randomly while they're not playing. Do you see how silly that is? It's also much more thematic to Warhammer. This is a roleplaying game in which the players play as protagonists. Their mechanical stats have far more to do with their ability to interact with the game than they do with what kind of character they're playing. You're not making unequal characters, you're making unequal players. Basically saying that they're all going to run a relay together but some of them get to wear running shoes, some of them are barefoot, and some of them have to wear weighted clothing.
You're not actually portraying the setting through roleplaying, you're just playing a game that's unfair.
Nim you can't seriously tell me an adept is equivalent to a tech priest. So all adepts should be npcs? No player should choose adepts because adepts can't generally surpass tech priests unless they build just right? Do you see how silly that is?
Dark Heresy, warhammer gaming for that matter save Black Crusade, you are not the protagonists, you are a space nazi actively hunting people deemed dangerous or actively suppressing information the government says is bad actively propping up a dying system of bureaucratic nonsense that can manage to lose entire planets due to a misfiled paper. You're just keeping the clock going a little longer.
Basically what I'm saying is that in the end it shouldn't come down to characteristics, they should help you understand your character as a person, but in the end there are plenty of ways of playing to get around skill tests that are "unfair" for some and "brokenly easy" for others.