I don't see any character development (or characters to begin with) in Tetris. I don't see any narrative there either. Not even structured decision-making. Hell, it's be hard to justify Tetris as a setting.
But as I've said some days ago, I'm sure that if Bethesda released a tetris game titled "Fallout 5", there would be people arguing like you, that it actually is an RPG. A great one even! This is the evolution, get with times and take off your rose-tinted nostalgic glasses! Bethesda now owns the IP so they decide what is Fallout!
By the way, I'm not joining this "F4 is or is not an RPG" as I've never questioned that it is one.