People said my game was too hard, I said I am just following the guidelines in the DMG, and people responded that maybe the DMG doesn't know what it is talking about; hence this thread.
The DMG absolutely says that everything should be a struggle, and actually takes it even further than I do, for example it flat out says that a fight without resource loss on the party of the players isn't a challenge and shouldn't be worth any XP.
After killing a huge dragon that took everything the party had player one might think:
"Man, that was a super tough dragon. He took everything he had! But in the end, we pulled through! We are such badasses!"
While player two might think:
"Man, that was a super tought dragon. It took everything we had to pull through! Now we have nothing left, and are the weakest and most vulnerable we have ever been!"