People always say games don't really excel in plot and storytelling and it's best that it stays that way and focus more on gameplay. Well, they're entirely wrong. Especially in the West, before the advent of FPS, games were all about plot and storytelling. All you need to look at is the adventure genre. Games have the capability to tell stories in a way different if not as good as the legendary mediums, film and literature due to its inclusion of interactivity. Contrary to what many would believe, interactivity does not ruin storytelling but in fact makes it more immersive with the right elements in place. Deep themes could have been covered. The truth is, there are still numerous themes and settings video games haven't tackled yet.
Watch this video because it will enlighten you. Part 1
The key to the failure of today's games in plot and storytelling does not lie in the developers and publishers but in the gamers themselves. Satisfied with mediocre storytelling with greater emphasis on action and cinematics, games that actually have great stories will never be created in high budgets and will never sell well. In such an environment, the development of video game storytelling will never arise.
Games that have great stories are still being made nowadays but they are so obscure and unknown and usually low budget that they will never achieve great status in the industry.
RPGs also used to tell great stories but this gen's RPGs just aren't good as the old ones.