If this argument is going to keep going like this, it is not going anywhere.
First things first, peppy strongly rejects the idea of a single hitsound, therefore silent hitsound is just going to be rejected in a second
Secondly, xxbidao is trying to recommend silent hitsound, which is a great input on maps, however, silent hitsound can be achieved simply through skinning and ignoring hitsounds.
Thirdly, if hitsounding is TRULY needed for maps to rank, I don't think it is as much of a deal, hitsounding is NOT hard at all, key-sounding is hard since you have to go through countless processing of audio to get there. No one is asking you to key-sound the entire map, just a simple hitsound rhythm will suffice.
Fourthly, if you don't want any hitsounds on your map heard at all, because it is not the intended experience, put it in the description or use "preferred skin" to achieve this effect.
Lastly, if you can't hitsound your map, even with the simplest clap rhythm or bass kick (drum finish) rhythm I think you are just plain lazy.
Why hitsound the map?
I don't know, ask peppy or for the sake of being able to hear what is being pressed down, I have no strong disagreement to why you must hitsound the map, or not to. I just don't think this is a big deal here we are facing, after all, hitsounding is not hard to the extent that you quit mapping.