A few days ago I proposed this idea to make the shop and the mission board more functional. The more I think about it though, the less I like the fact that at there’s no connection between what you do in the game (difficulty, performance, etc.) and what equipment you get, which doesn’t feel very rewarding. In any case I still think it would be an improvement over what we have at the moment for sure. On the other hand, having an RNG system has the feature that it doesn’t lock out the satisfaction of getting high performance gear for players who are not interested in beating the highest levels of difficulty (not saying it’s better or worse, just something else to consider).
I would be surprised if any drastic changes are made any time soon (i.e. I don’t think the RNG factor will go away). We shall see.