Should the split ring on a new lure always be used?

I am real new to bass fishing and I read a great thread for
newbies (in the rofb archives) re the pros and cons of using
snap swivels, barrel swivels, 2 to 3 ft leaders with a
swivel, etc. The opinions were varied but no one
recommeded attaching a swivel of any kind at the lure.
However, none of the guys who posted in the thread
addressed the split ring that often comes with a new lure;
e.g. a crankbait. Should I attach my line to the split ring
for the best/correct action whenever the manufacturer
provides one? I recall that some really good fishermen have
advised me that when trout fishing with a spoon, to always
tie the line directly to the spoon for best lure action.

TIA
Ed Sievers (aka "Old Phart")