No matter how much you know, no matter how hard you try, if the takeaway of your swing is incorrect, your brain will tell your arms to fire in the downswing causing a deflection of the plane and the necessity of compensation. No exceptions.
Willpower can’t overcome physics and neurology.
This is why I believe the takeaway is critical to understand and spend time improving! I call it a HEAVE (from David Lee’s Gravity Golf).
This isn’t to say one can’t produce a great shot, just that one MUST compensate each and every time to make that happen. It’s a very difficult and frustrating way to play golf.