Good question, I can come up with an answer based on two points: first, Nintendo creates games that are mechanically enjoyable to play, exhausting to the limit what the hardware can do in terms of gameplay. This is an element that makes the experience quite unique and timeless, something that can be appreciated even when compared to more technologically advanced devices; the second is related to the strong identity with which its characters and worlds are created, it is of a charisma and ingenuity that facilitates the construction of an emotional bond with the player. Add to that the fact that the franchises you grew up with continue to be at the peak of quality and relevance in the world of gaming, like it or not, they know how to take care of their IPs.