Wrong. I'm perfectly capable of creating complex encounters. It's just a fact that the system actively punishes any DM who tries to set up a FUN encounter because there's so many special abilities that just simply solve any inconvenience at the cost of an action.

My players should feel rewarded because they managed to build a campfire from discarded boxes so that they have a steady source of light during an important fight and not feel punished because they picked one of the threeish races that don't have darkvision.

My players should feel clever because they managed to fashion a pulley system to move a significant amount of treasure out of the dungeon and not because they just stuffed everything into their bag of holding and forgot about it.

5e is boring by design and making it interesting means fighting against the system every step of the way!