What do you mean by that? Do you know something that we don't!
Business. Bethesda prefer not to add any of the real good, and great, stuff into the main game cause they can make profit from putting them into DLCs, and other stuff...
Also, you gotta remember that when us PC Modders create mods for the PC version of these games, it does attract the attention of the Console users.. No? Bethesda can actually make a profit from the console users cause once their attention is attracted to the PC version then they might actually buy it which means one person will buy the same game twice thus double the profit.. Happened with me, that is for sure. I got Morrowind for the Xbox first, cause I didn't like PC gaming that much, but after I learn about modding.. I bought the PC version just to get those mods..
In other words, they are trying to get as much money as they can out of Skyrim, which is their main point.. They are working for profits, no?