This kind of thread has popped up a few times and I feel like most the arguments have already been made in this thread https://forum.weightgaming.com/t/thoughts-on-jrpg-rpg-maker-games/
That being said, I’m going to basically reuse my argument from that thread. Making games is really hard and requires a lot of different skills. It can be overwhelming to have to have to code, do art, write story and dialogue, build maps and all the various facets of game development. RPG Maker helps take care of a lot of the back end sort of work so developers can spend their time actually making a game.
RPG Maker has a lot of support, both here and elsewhere which helps ease the process of making the game the developer wants. Given that low barrier for entry and massive quantity of resources, it just makes sense for developers to use RPG Maker, especially for a first game.