My personal travel game is Hearthstone. Only online card game I'm decent at.
On the bog though it's Minesweeper.
But yeah Steam are very late to the party on this and Rift is not a game that should be played on a mobile. It can be but it most certainly shouldn't. Now Lineage 2 Revolution yes because that was literally built for mobile devices.
But games like Rift, FF14 and WoW just no. As I said if FF14 ever does a smartphone version I'd question why the fuck did the devs do that when they dropped PS3 support because of it being a limitation.
And Celestalon can sod off with WoW on a tablet. I don't care if he is a dev.
As for Rift. I imagine since Trion can't even optimize a game for AMD CPUs or multicore they would not be able to optimize that godawful Gamebryo engine for a phone.