I still use a number of revolvers with iron sights, and I like them a lot for some purposes. I also began scoping handguns in 1979, and today use them on many revolvers and single shots. It does take familiarity and practice, but there is no question that a person who applies themselves to the task can learn to shoot more accurately with optics, whether scopes or red dots.
Why scope a handgun / revolver? For the same reason one scopes a rifle: To aid with more accurate bullet placement, and when necessary, to help thread a bullet through trees, brush or even other herd animals. Although I've hunted with many rifles over the years, today and for some time, I do and have hunted only with handguns. Given a choice, I'll select a revolver when possible ( for the best reason in the world: I like 'em) unless the game being pursued is likely to be found between 125-300 yards.
I can't abide wounding game. Scopes are one element, along with practice, and an adequate gun / caliber, that help prevent such unsportsmanlike situations.
I find target acquisition to be faster with a good scope than with iron sights. However, I have many years of experience in doing both ( I'm an old feller ). Someone who is new to using scopes does indeed need to shoot and practice with them a lot...but practice is necessary in any event.