Even the Fox guide is full of careful careful type stuff. I personally don't want to be chancing a £300+ pair of forks by poking a screwdriver around the stanchions pretty much every week or two.
It's not comparable to cleaning a chain – stick the chain cleaner on, hose it down, oil it. There's no risk of ruining anything expensive and I dont have to take anything apart. And the thing with a chain is that it's the best system we have at the moment for drive. With forks, you can choose to stick a set of open bath Marzocchis on and look at them once a year.
Whereas with the Fox I either go poking expensive things with a screwdriver or take the forks to bits, which means I need something to hold the bike up whilst I do that (workstand?).