They have made quite a few RPGs. /Thread
If we're splitting hairs, they've
produced quite a few RPGs; actually having an internal developer assigned to the creation of a RPG, that's limited to Japan Studio's Legend of Dragoon I believe?
There's a few others that might qualify in a nitpicky discussion (and that's still only if we're talking about the stat-building, usually turn-based/time-based combat game we most easily label "RPG"; the big open-world games epics with crafting and grindy or looty combat design blurring lines like Horizon and Bloodborne do then you start getting into the "
What exactly is an RPG" conversation...) In general though, Sony has turned to partner studios when it has wanted to enter into the RPG market.
In the Japanese development structure, the Producer role still is often a creative role, and the home office may be responsible for the graphic design, character creation, scenario/script writing, actor VO performance, conception of combat or world design, sometimes even the direction of the game, so we shouldn't take away from Sony Japan Studio in particular its many memorable RPGs (for fans at least,) but the credit of an external dev team still would usually label a game such as Dark Cloud as a Level-5 game rather than a Japan Studio game.
The one time Sony has ever said, "Oh man, these RPGs are pop-u-lar, we have got to make one of our own!", and hired staff at Sony specifically for making games in that genre, it is curiously limited. When you think "RPG", many gamers think PlayStation, and yet both Nintendo and Microsoft have each had numerous studios (internally-raised or acquired) making RPGs; even today, Nintendo owns Monolith and Camelot and Intelligent Systems and maybe others I'm forgetting; MS has Obsidian and Inxile and Worlds Edge and Playground Games and Bethesda. Sony on the other hand has never really has done that.