Today we have very high quality true 1 power variable scopes that are quicker to get on target than any iron sight. An example is the Leupold 1-4X20. That optic allows for longer shots if needed or quick up close work. For me a scope at 1x is easier to get on game, not having to line up sights is my main reason. Being brighter than the human eye at dawn and dusk is a plus. Plenty of these scopes made today aren’t true 1x, a lot of them are 1.5. I think thats still acceptable for most people. Red dots are another good option but a totally different animal all together.