The poorer the technique, the more important the sights.
The better the technique, the more the sights become a reference to technique.
Technique good = sights automatically on target.
Technique not good = sights are needed to correct.
Good technique is a large concept, including stance, grip, natural point of aim, trigger and gun manipulation, transitional skills, moving skills and more.
It can take years to get really good.
Which probably explains why there are so few really skilled shootists.
Lock the doors, they're coming in the windows.