I'm not arguing that a mouse isn't faster than a controller, nor am I arguing that a game couldn't potentially map unique functions to each individual key on the keyboard, I'm asking for actual examples of games which would be impossible to replicate on console without removing gameplay functions because they require x amount of keys. None of your examples show this, they only show that the combo of keyboard and mouse can be faster than a controller. I don't even know what you're getting at with the bit about text and inventory. How is scrolling down a list or page of text with an analogue stick different than dragging a scroll bar with a mouse? How is using shoulder buttons to cycles through tabs different to clicking those tabs with the mouse button?
I already gave the example of movement in a game like Mass Effect and the differences between PC and console. In such a game, the PC needs to use more keys because there is no single key that offers the functionality that a single analogue stick can. In this example, the PC version uses more keys than the console version, but this doesn't open up any more options, it offers no greater level of functionality.
There is actually someone on the DX3 forums who asked that there be more "stuff" in the hud, because it gives the impression of a more complex game. They weren't even asking for complexity, just the illusion of it!
I really don't get the idea that more stuff = more complex = better. In Trespasser, I have to do more "stuff" just to pick up an item. Rather than using a single key to pick up something off the ground, I have to use a key to hold out my hand, another one to rotate my wrist... it's more complex but it's also completely and utterly stupid.