this is one of those things which many people believe but which isn't actually true. authoritarian dictatorships are very often total chaotic shitshows.
the old line about Mussolini making the trains run on time is a great example. Mussolini used propaganda to claim that he made the trains run on time, and he did drive a few improvements to high-profile train lines in Northern Italy that were used mostly by elites and tourists, but trains in Mussolini's Italy were not efficient, not well-maintained (and therefore not safe), and they didn't run on time.
https://www.snopes.com/fact-check/loco-motive/
https://www.bloomberg.com/news/articles/2016-11-15/stop-sayi...
there's even an academic term for it: "the myth of fascist efficiency." Hitler's regime was also pure chaos, and he was largely regarded as a clown for most of his political career. authoritarian dictatorships lack legitimacy, so they're run by people who don't care if they're perceived as legitimate or not, which basically means fanatics and grifters. fanatics are too disconnected from reality to be highly effective, and grifters have a vested interest in chaos, since it makes their grift harder to detect.