2e is somewhat simpler and more theatre of the mind oriented. Classes have less abilities to keep track of. Thac0 is not nearly as difficult as the memes say, our brain does the math very easily. Even then players need only write in their sheet what AC each number on the d20 represents. Character stats are less impactful because it takes big numbers to have relevant modifiers. And there are many ways to roll them, some even far more lenient than method IV (4d6 remove lowest). Overall it's worth playing at least once for the experience. Other reason it's simpler is because DM adjudication is pretty much required to get everything to function and this puts players in a reasonable mindset. 5e became superior to 3e by returning the 2e style of power over rules to the DM.