If you're talking about Tenet, people didn't find it confusing because backwards moving time is confusing. They found it confusing cause 90% of the movie is overexplaining the concept through unintelligible dialogue, using a menagerie of unnamed characters in unexplained settings to deliver said dialogue.

That movie solidified in my mind that Nolan has surrounded himself with yes men and has lost the touch. A warning I should've heeded before I wasted my time on Oppenheimer