I feel like short also incentivises team play, you have to cover, use gadgets like smoke, barriers, skills, etc. For instance I loved Bad Company 2. That game had a high ttk compared to cod at the time, but games now a day have a huge ttk, like apex, the finals, fortnite, etc. I would say If i cant kill 3 persons with one mag, its good. I cant do that in apex or the finals.