Shooting, like many other skills, is rather simple. The fundamentals (structure, trigger control, sight alignment/sight picture, breathing, etc) remain the same regardless of the type of shooting you do. Now different types of shooting may focus on certain aspects or groups of fundamentals, but they are all important.
Rapid firing, advance techniques, and assorted tactics build upon the foundation that fundamentals provide. For example, if you have poor trigger control and stance you will shoot poorly in rapid fire.
So we have to practice. In practice we may have to focus on certain aspects to improve them, like dry firing to work on trigger control. In practice and training we can take the time to focus on what we need to do correctly. But we must practice enough to internalize this. If your laying prone in the field, and your target is stationary and far away, you may have the time to think about trigger squeeze and sight picture. However should you be doing room clearing, there isn’t the time to focus on the fundamentals.
To paraphrase Bruce Lee, you must find the tools, sharpen the tools, then dissolve the tools.
The serious shooter, regardless of whether they are practicing for Camp Perry or for combat raids, needs to practice until the fundamentals can be done with out conscience effort. At a vital time, you may not have the time to try and remember the fundamentals if you haven’t already made them muscle memory.