Hey man, you might be new to the internet, but I was around when indie games were taking off.
Fez, slenderman, and even journey all served to show what people were willing to accept. They were all considerably lower quality, cheaper, and easier to make than AAA games.
Hollow Knight is just the latest entry into that category.
Try playing some older AAA games to see how much effort was put into them vs. what you've been conditioned to accept now. There's a world of difference between Castlevania: Symphony of the Night and Hollow Knight.
You just don't see it because you've never played those older games because you're new to the world and part of the consumer bandwagon.