I don't think it's about being fair or unfair to FFG. I also don't think just because other companies don't do it is a valid arguement either. There are plenty of companies that have rule sets where you can use models that they don't produce.
There are many voices here and on the DT site that want classic troops and walkers from the Dust Models website. The justification from Christian, backed up by the feedback from Andy doesn't hold water for me (i.e. I don't believe including these will confuse retailers or cost sales). If FFG can't figure out how to make that work even in some sort of unofficial "can't use this in organized play" way, then it tells me they don't want to listen to the community.
Not listening to the community, really? So I guess that wasn't the CEO of the company that I saw on Boardgamegeek, taking his time to address multiple issues that Grand Inquisitor Kris was spouting off about. It's not about listening or not listening to the community, it's about their vision for the game, and what they think is best for the company (not what we think is best). I don't care either way, I've never been a straight historical guy, so the idea doesn't really push me either way.
And give me one of any of the huge gaming companies that make rules for models they don't produce, and name me one game that FFG produces in their entire catalog that allows you to use something outside of what they produce. It may be there, but I can't think of any. Again, i don't care either way, I just don't want FFG to spend energy developing stuff they aren't going to make, and keep production of what they are making up. If they make a halftrack, then more power to them, add it to the game and give me a card for it. If not, then keep all energy in what is being developed and leave the other stuff for the fans to make.
Easily. As I saoid before. Games WOrkshop. Dark Eldar and Dark Elves. For years had troops in their books that had no official figures for. Necromunda. Warhammer Quest. All had stats for things that didnt have figures. Secrets of the Third Reich (not FFG of course) allows use of other minis. As do many other games (even back in the days of T$R, AD&D's Battlesystem let you use any mini you wanted).
And if you dont care, why are you so quick to tell others to stop caring? Honestly, people have voiced an opinion of what they want. So you dont want it. Lets say FFG decides to do it. Are you somehow put at a loss for it?
Early GW, before they had the full might of the TT world behind them, even had tutorials in White Dwarf on how to use other games, other figs in their game or how to make models out of ordinary products (such as the land speed made form a tube of deodorant).
Lets say FFG decided to make a bundle of 30 cards that detail 30 normal trool types and vehicles. Lets say they charge $20 for said bundle (probably closer to $30 or $40 since they dont make models for it) then they will make money from that product as just about 70% of the fans will buy it, whether they buy a model for any card or not. All FFG is out is the time to write the stats, the art for the stats, the time to design/make the cards and the cost of the cards. And in the past FFG has had no issue at having interns do similar things. And FFG is capable of not only allowing the Dust Models figures in their games, but also selling them through their site, at least to the North American market. Making even more profit themselves.
The sad fact is, that without some normalcy and regualr style new troops (who are interesting, be it from skills or different weapons) Dust will die because in 2 to 3 years it wont be about the best pleyer, but who can field the latest Gorilla in Vrill Armor 4 Power Armor with 10D mega-damage death-phaser laser steam gauntlets in walkers! And players will become bored and move on to the next WW2 Variant Sci-Fi Pulp Game.