You have to look at really successful indie games, such as Terraria, Factorio, Mini Metro, Stardew Valley, Darkest Dungeon, Papers Please.. and there are many more. If you look at these games do you really think there is an alternative reality where they would not sell many copies? I don't.
And if you have a good look at them you should realize that they all are extremely polished and coherent. None of them has realistic AAA graphics but they still look good. None of them is just a "copy" of an existing game. They either bring something totally new or bring something known but with a greater overall quality.
Then you have successful niche games such as Cogmind or the Zachtronics games. They still have the mentioned properties but also target only a subset of players where there are not many games. I think that makes them guaranteed sales.
Now what's wrong with all the stories about failed games? They all are generic. They don't offer something special. And this is what doesn't work in a saturated games market. And I'm not saying the authors didn't work enough. They just don't see what's wrong with their games and continue on their path to demise.
I guess what I'm saying is: to make a successful game you don't need to be the greatest coder or greatest artist. But you need to understand what makes a game great and enjoyable.
Maybe the days (years) will come where I finally will make a (bigger) game of my own and maybe I will totally fail like many have. Maybe I will revoke everything I said here but today this is my opinion. :)