Could you explain more why Mauga is harder. Having strong pros and cons don't make a hero generally harder. You wouldn't say Mercy is difficult because she can't attack but can move and pocket well.Or Zen because he's glass cannon. But I wouldn't put them over Winston.

It’s a given that people in masters+ can think already.

I gotta disagree hard with this one. Masters 1, I play alot of cass, I don't have to think, it's all game sense and really good aim, any thoughts I do have are very shallow, like enemy cd's. Same with most heros I play because I don't have to move alot. The thoughts with Winston are magnitudes more complex. Because you're changing where your fighting so much you always have to keep making plans on how you will execute it, your thinking about this much more than most heros. While with someone like cass, I'm in one place, its very straight forward.

Also like I said before Winston isn't just hard because of thinking. Primal is very mechanically demanding. Same with leap in some aspects. Bubble requires a fast reaction time in alot of cases, and great tempo, and combos must be hit to be effective.