That's a lot of assumptions from just your personal views. (and they are a relic of only 6 years ago by the way).
Enough people either have or know about the VDR rules, that they are legal for the Astromoni-con (the largest tournaments in Canada).
It's also good to know how you feel about Dark Eldar, Witchhunter, Daemonhunter and Necron players. How about we just tell them that they aren't allowed to play anymore; because their codexes are relics from almost a decade, and two editions, ago and don't have any Forgeworld or GW support!
The fact is that you can use different rules from different supplements; usually to be used within the game set is was meant for.
In Apoc, you should use the Apoc Flyers.
For normal games you can use the flyer rules that are made with that type of game in mind.
In planetstrike, you should be using the planetstrike deep strike rules; which are different then the rules of other play styles.
In cities of death, template weapon work differently then in other games.
The list of general rules that are applied different depending on the type of game being played is huge; there is nothing that forces you to use the same rule (from a different supplement) for every type of game.