Alot of console owner have either fallout 4 or skyrim remastered so even though it doesnt effect alot of games yet, it still matters. Besides that, the point is that xbone actually has decent community mod policies and support whilst the ps4 doesnt, thats a fact.
Not everyone has the time or patiences to fck with gaming rigs, thats one reason consoles sell, they are convenient.
The point is mods are a non factor in console gaming. The amount of people that have those games and use the mods is so small it's not worth bringing up in a argument about the value of each console.