Lets say 10 years ago a game called Malo came out thats a FPS for the consoles. This game was a huge success it offered 10 weapons allowed 10 v 10 games in fun but small maps. Over the next couple years other games of the genre used some of the basics of Malo but added things like more weapons, attachments for the weapons, larger maps and more people to play at the same time. Now games are using 20 weapons each with modes/attachments, 20 v 20 games, Very large maps with vehicles this becomes the standard for the genre.
So now hardware of portable systems has gotten better so developers start seeing a chance to make money by making the same game for consoles and portables. Slowly instead of porting games over from consoles to portables they decide to just make one game that both can run. Well since portables aren't up to the same specs of consoles devs figure they can still build the game. Instead of 20 weapons they figure they can get away with 12 and instead of giving each one modes they give some modes and a couple attachments Games are back down to 8 on 8 because portables can't handle more. And Maps are back down to small to medium size. And not just one title is being released like this but all of them are, so this is starting to become the standard.
You going to seriosuly tell me that your going to be cool with seeing this sort of "progression".
As for why do people create for the PC. Because they can truly be innovating, because gamers dont drool in general for console FPS's to be ported over to PC they drool over PC games to be done on Consoles- BF series, COD series, MW and now Crysis.