I would dispute "RPG fans", since even turn-based RPGs require mechanical skills, just not aim-and-shoot reflexes; and as someone who's spent 5+ years in Elder Scrolls Online where I clear group dungeons and world bosses solo, there's RPG players who don't need an easy or normal mode, let alone "very easy".
As usual there's people who call this attitude "elitist". Well, sure. Dr Seuss, Dan Brown, and the Hardy Boys/Nancy Drew writers wrote in easy mode for babies. But most literature is above that level, you have to be able to read at a college level to read David Foster Wallace's Infinite Jest, you need some math & physics education to read Greg Egan's Diaspora, Schild's Ladder, Incandescence, or Dichronauts, you need a computing background to get more than superficial understanding of Tracy Kidder's The Soul of a New Machine or Rudy Rucker's The Hacker and the Ants. Those are elite entertainments. There's no way to dumb them down without totally ruining the experience.
In Kojima's case, his games are already compromised that way, endless tedious unskippable(!) cutscenes instead of getting to play the game, so I doubt it really matters. The Onion's new experimental videogame article nailed this, and Squenix was going down this road with their CGI movie adaptations, before they veered back into making actual games. Maybe Kojima will someday head back away from idiotic "narrative" and even more idiotic actors which the form is ill-suited to, and back into things with gameplay, strategy, and action, or maybe he'll just make movies and stop pretending this is playable.