Pre-capture on my Canon EOS R6 Mark II camera is brilliant, but the feature is flawed for this one reason

Sequence of bird in flight over a field.

For action, sports and wildlife photography, the ability to use a ‘pre-capture’ mode to secure a series of frames before you’ve fully depressed the shutter button is a huge boon – and one of the most significant advances in the age of modern mirrorless cameras.

Camera manufacturers have different names for this mode; it's called Pre-Continuous Shooting on Canon, Pre-Release burst on Nikon, Pre-Capture on Sony and Pro Capture on OM System, to give a few examples.