In every game you will ever play there will be certain things that are better than others, and when its about competition, people will use these things because, you know, competition is about winning and when you go to a shootout with a Knife you will most likely get killed on the spot without having a fighting chance.
That’s just how it is and how its always going to be, the only thing to keep track of is the number of guns you can choose from, and in duelyst the numbers are pretty huge since shimzar, every faction has at least 2 viable deck types with myriads of variations that are viable. So no, even in the competitive levels the diversity in duelyst is refreshingly high right now and I really don’t see a reason to complain about a lack of diversity. Sure you can’t just play any kind of crap/meme decks and expect to win with it on highest level of play but thats true for every game/sport/competition that has ever been made.
