I agree there’s a big difference between casual games and… “advanced” games.
But splitting by platform is a bad way to do that. Xcom2, Rome total war, alien isolation. The full version of all those games is on mobile, none of them are even remotely “casual”.
Touch input can limit the kinds of games that play well, twitch shooters will probably never be great on mobile, but advanced strategy games are perfectly suited for mobile.
I agree there’s a distinction between the 2 markets. I’d place it more on the style of monetisation than anything else, but I’ll admit there’s a difference.
But I still think using the platform to distinguish them is unhelpful, phones aren’t going anywhere, they’ll grow as a market and slowly absorb parts of the console and pc markets, so either the non-casual phone games industry needs to grow, or casual games will be the only games left. I think it’s fair to say that phones are currently infested with low effort casual games with awful monetisation strategies, but they don’t have to be, and quality games do exist on the platform and do have a following, my hope is that continues to grow and finds a niche on the platform, so hopefully you see why I dislike defining the platform as casual with “novelties”