Yes that's true. People like Game Maker games and Unity games, it is just the brand of RPG Maker being too much the same. I actually decided to make my own battle system to try to get away from the bad turn-based rap of RPG Maker. It is just to make your game feel distinct from the RM brand is what is massively important. The brand is the Final Fantasy style game with generic systems. That's what you have to avoid. A high quality version of this still will not sell. I have seen pretty high production value games on Steam do okay with the generic systems, but most of them absolutely do fail. As for good game designers, they already found what they are good at and can sell. Once they find an audience and fanbase, they don't change their style since they don't have to. The indies like Notch via Minecraft are examples of good game designers. He was going to make more games, but got bought out by Microsoft and left the industry. A good game designer may be unknown until their first massive hit. then they quit innovating and keep selling what they are good at making. They have a fanbase now and there's no pressure for them to keep innovating and being original. This is when production value and polish comes into importance now, you have a fanbase try to keep growing them and improving the base style you have in your game design.