I think that ultimately, the problem with authoritarian regimes and dictatorships is an efficiency vs resilience problem. Dictatorships are super efficient. There is no back and forth, no debate, no bureaucracy except that allowed to be. This can create an illusion of progress early on, as all those things that were eternally in the future will start to get tackled. The problem is that it is not a resilient system. It relies exclusively upon the dictator and their understanding of the world. This is not a problem in the areas of expertise or if the dictator is smart enough to understand their limits. But at some point, there will be a mismatch between what the dictator thinks is important, necessary, or true, and what really is. Be it ego, being surrounded by yes men, being detached from the general population or a minority group, or anything else, the dictator will make bad choices, and there is nothing in the system that can prevent that.
that is just a revolution, not a dictatorship, then.
the difficulty with that, is when to give the power away. obviously you would need to keep it for long enough to make sure that the system will stay in place after you are no longer in power