About the recent Design Value: Mastery
For the context...here the quote i want to address up first:
Adaptability
Adaptability is both your ability to learn and respond to new ideas, new threats and new changes, along with your ability to play in a variety of styles. Different players are adaptable in different ways. Some choose to pick up a large number of champions, while others spend that time deeply mastering one along a variety of builds. We try to support both, but fundamentally believe that to pursue mastery in League is about being an adaptable player.
Our primary method of rewarding adaptability is through system and play balance changes. We aspire to keep as many champions as possible viable at a competitive level (to mixed success, admittedly), and also spend a lot of time trying to increase the amount of viable team-level strategies. The better balanced the game is, the more we can reward players who remain adaptable against a wide breadth of threats, and similarly reward them for investing time in learning to play less-popular champions and strategies.
So I think you actually contradict yourself with recent decissions and some longtime shortcomings:
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you stated that you don´t want to make major changes so close to worlds coming up - though this would actually reward teams that are more adaptable than others, just as your design goals here seem to be
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champ-select is very stall since like forever, allowing Teams to only prepare a very small amount of CHampions and Tactics...as the pick&ban-phase is not restrictive enough and fairly easy to predict currently. I think adding some more layers of bans really would accomplish a lot in terms of diversity in champions an tactics played - really rewarding more adaptable teams that have mastered more champs and strategies (maybe look at DOTA 2 for inspiration, while i really can´t stand most of the game....the pick&ban phase is a lot better there)
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I think you should maybe create more niche-items like thornmail/aegis that allow you to adapt to specific things like a snowballing-ad ingame on the flow, as they are more interessting than overall nobrainers like pen or an IE for carries that work in any situaton (the pen-system really is still not in a good spot at all).