There are some topics that may help accuracy but still not properly researched yet.
‘Rate Of Closure’ at impact.
Using a passive club squaring technique to help time the squaring of the club by impact - uncertain whether this involves less timing than solely using active musculature forearm rotation.
‘Drive Hold Hand Release’ actions as explained in Dr Mann’s website (link below). The current 3D systems currently do not operate at a high enough frequency to identify and measure ‘Drive Holding’ hand release actions post impact which should minimise ROC (Rate Of Closure).
Hand Release Actions Through the Impact Zone (perfectgolfswingreview.net)
Generally swinging the club on the functional swing plane as per Dr Kwon’s image below (although I don’t fully agree the hands being on the same functional plane).
There is definitely scientific evidence that proves external focus cues help accuracy, but that is more about improving/retaining ‘Motor Learning Skills’ rather than specifically biomechanics (hear podcast below).
Personally, I find it more fun seeing Tour Pros being challenged on narrower golf courses with small greens and lots of impossible rough/hazards with the wind blowing hard. I don’t find it entertaining at all just seeing long drives and short irons to greens.