I believe Kayn`s concept was made from the largest concerns from a assassin player.
No joke here. And I believe it is amazing since it is spot-on. Can you remember how many times you fked your teams comp by picking an assassin jungler at early stages of the pick screen, and then found out that the enemy countered it by picking so many bruisers? It gives you the feeling that you are not going to have any sort of fun that game unless you totally own them early. And then being forced to buy bruiser items like cleaver-deadmans. This problem was a huge concern for assassin junglers for a long time and it was very stressful. Since you have no control over the situation.
The beauty of Kayn, is that he gives a solution towards this problem in the most efficient and impactful way. And gives you control over the whole plan of the game, which was lacking in assassin playstyle. I also believe it is a revolutionary design in itself, that Riot giving a message that Assassin bruisers combined are no more a thing.
