There are 20.000~ games available on PSN and sees 150 releases weekly?
It doesn't matter how many alternatives there are, it is one market that is littered with garbage.
I wish PSN would have that much but unfortunately they wont see those numbers mainly because Sony refreshes PSN every generation (at least going by this gen) - hopefully the next Playstation (5) will support b/c with digital titles but I'm not gonna hold my breath on that.
Also ,surely you jest about the number of games coming out a week, do you honestly go through each and every thing that is released in a physical store or do you go search for something you know you want like a normal person does lol.
The number of alternatives do matter because you are given a choice of buying what you want, when you want and where you want just like on consoles.