Game wise.. they already have Oblits, monstrous deamon creatures, and possessed who have the potential to be cc monsters. Why give them attack bikes to?
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Why not? Attack bikes not supposed to be cc monsters.
why can't space marines get oblits?
replace "chaos marines warped by the techno -virus"
"with Adeptus Mechanicus develop experimental super-awesome terminator suit"
FOR THE SAME REASON: Game mechanics. The codicies are play tested and every army is designed to have a unique feel.
If I sound like I'm being hard on you, I'm not. I went through the same thinking with many of the armies I played or thought about playing.
It took me a few years to realize the secret is to find the rules and playstyle you enjoy most. Do not worry about which army has the coolest models...
Then buy the models you like (lookwise) that approximate the units you want to field (rules wise) and modify them enough so that a player can not take a quick look and say, oh that just a plain old ____.
There are quite a few armies out there like this. An airborne cav army that used really cool looking tank skimmers (they still only played as chimeras).
Like the tau and their tanks, but hate the rest of their models? Make a Star Wars stormtrooper army with white armour and modify the original models or use similiar models to represent them. This is the point.
I have been into the Imperial Fists for years now. One of the main reasons was they were the complete opposite of my Space Wolves, my own first army. Plus they're very hard to paint well and so you don't see many of them.
We all know that the next Vanilla 'dex will play similiarily to DA/BA.
I was very happy to see the new Dark Angel/Blood Angel Codecies.
Tired I was of las/plas squads and wanted to see a return to a more "shock and awe approach" to marine warfighting.
The BA dex is as close is it gets right now to simulating a codex chapter if you use lots of fast attack.
I would feel much worse using ravenwing scout rules for my IF than a few crazy goth buggers who need a chaplain nanny.
The only thing I am careful about is not placing IF insignia's on troopers. I put those on the doors and roofs of my many rhinos and other vehicles. If I go to a tournament and someone feels like giving me a problem, I flip over the top hatches and doors to reveal big radioactive hazard symbols.
Oh look, they're "RADIATION MARINES" they glow a blinding yellow...:bye: