BDS wrote:

Every year there are instrument rated pilots who get killed in "continued
VFR" accidents. "Knowing how" to fly on instruments is not the same thing
as having experience and maintaining proficiency.

Another issue is knowing WHEN to fly instruments. If you consider to
look out the window at nothing (or confusing visual indications) rather
than hunkering down on the gauges, you've got only a short time before
you lose control.