If you've grown up with the gaming industry the last few decades, you might have noticed a "narrowing of scope" when it comes to which genres and game mechanics get routinely produced by the upper echelons of production.
Where the late 80s convinced the masses to give gaming another chance and the 90s took us into 3D with the medium-shaking likes of Metal Gear Solid and Ocarina of Time, the 2000s became a hotbed for "Sure, why not!" game design.
The PS2 remains the highest selling console for a reason, and it's here where you saw every last idea - from franchise tie-ins to quirky one-offs - getting greenlit by some very wealthy publishers.
Cut to the 2010s and with the industry bigger than ever, game budgets are now through the roof. That means - to maintain the best graphics, animation and bankable formulae - only a specific set of ideas get through, once you're at a certain level of production.
As for the others? Well, outside furtive indie devs trying their best, the majority are put to the wayside for the foreseeable future.