I don't think so. I don't play nearly as often as I used to, but I still do alright. Though, I usually play tournaments where "game theory optimal" can only get you so far. There is a lot more nuance in a tournament where your style should change as it progresses.

Pretty much. Not impossible but the effort reward ratio simply isn’t there.

It's become a lot more difficult to win online since online poker was banned in the USA. The USA sat at a huge net loss online and every other country profited.

agree, and this is what I've heard in general of the post shutdown landscape

When I left (or, got shut out, so to speak) in 2011 the games were getting a lot tougher, less big fish and more reg on reg with marginal if any edge, where you're essentially just paying the rake (-%rakeback).