I was briefly into 40k in the 00s, but once the 2010s started I slowly started getting an ick feeling from it but I couldn't quite put my finger on it.
specifically, I was still cool with most of the lore, but the Imperium fanboys were getting to be unfun to be around. As I got older and wised up, I figured out around the same time many others did, that these same people just had a fascism fetish in general.
so with all that said.
Death to the false emperor Let the galaxy burn BLOOD FOR THE BLOOD GOD