And that's good, because as Ehstevey mentions, WHF has room for a bit of silliness, a bit of comedy, and a bit of black humour. Those elements are important.
I'd go so far as to say they are essential.
This is a fundamentally silly hobby. Most of us are grown men, playing with plastic soldiers. If you were to take this seriously you would look like a fool, or a manchild.
It is silly, it needs to be done with a laugh and a smirk. It has to be readily admitted as a non-serious thing we do for "I swear too much" and giggles.
Embedded in that is that the writers must not take the setting to serious, not reduce it to complete grimdark devoid of silly references and history nerd in-jokes. The setting itself needs to be built in such a way that you can laugh at it, but at the same time the characters and factions need to take themselves dead serious. Because that is part of the joke.
GW needs to keep doing stuff like have bugmans rangers gain flammable on a bad d6 roll from drinking beer, name lizardmen generals tik'tak'to, and have long very serious descriptions of orc clan headbutt-based powerstructures.
And GW needs more silly stuff like what we found in Gotrek&Felix. Because the second the grimdark gets so bad you no longer snigger every few pages of a GW publication, a game that is based around laughing with friends at funny d6 results has lost it's way.