The idea that the Imperium is justified in its extreme measures has always struck me as very repugnant. Not because I'm opposed to grimdarkness, but because it carries the implicit notion that the things the Imperium does are actually efficient or effective. And they aren't. At all. Like, we've tried this stuff in real life and the end result is pretty much that a bunch of people died for no reason. The real world's most terrifying war machine runs on the fact that weapons engineers want the new iPhone and will invent new and exciting ways to murder people to get it, which in a lot of ways is a lot more grim than anything the Imperium gets up to. On the other hand, we've seen the longterm dividends of the Imperium strategy in the real world too, in the form of North Korea. During the Korean War, just a few years after going fascist? Terrifying. Fifty years later? A technologically outdated, economically crippled joke that people only care about because of their ability to potentially set bigger nations with meaningful force projection capabilities against one another. What emergency measures do is burn your longterm economic viability in exchange for a short term burst in productivity (this is why they are reserved for emergencies), and the Imperium doesn't fight short wars.
And the Imperium is unable to realize this because those same emergency measures (plus the instability of faster-than-light travel and communication) choke off their ability to collate data and analyze data, and in any case the High Lords would probably rather execute any scribe who comes to them and says "the evidence suggests you're all morons doing almost literally the exact opposite of what you should be" than admit to perpetuating a system that qualifies for the galaxy-spanning empire version of a Darwin Award. So the Imperium is slowly strangling itself. And now it's too late. They no longer have the breathing room to back up and rebuild reserves. The galaxy is going to die in screaming agony not because the Imperium couldn't stop it, but because a hundred generations of its nobility chose to pass the buck for getting to work on a longterm solution to the next generation and now there are no generations left.
Heresy!!! Blasphemy!!! Betrayal of the Emperor!!! Repugnant lies!!! False facts!!! Incorrect ideas!!!
And we continue...
I see what you mean and it does make sense but get this. Fascism works. Yes now everyone is going to brand me as a Nazi which is ironic because I was born in the USSR (now Russia) and they lost about 25 million people against them. That was Nascism they fought. Same system just with an extremely rascist and cruel touch. Italy became more powerful thanks to Fascism however they fell in with the wrong crowd. Roosevelt had to use fascism to end the great depression. And by the way North Korea is communist. However past the fact that your references are wrong you are definetely right about the Imperium is getting weaker and will die.