It should not be forgotten that the silicone fluid in viscous or lock up fan clutches can be changed
so that the unlocked fan rpm can be varied - less to save horsepower or improve fuel economy,
but also more viscous to move more air.

Realize that fan designs done by CAD have greatly improved in the past 15 years - quieter and use less power to move more air.

Today’s best fans “look like mean Klingon weapons”
with sharp points, edges and creases that both stiffen and improve aero
but the blade positions around the hub are not always symmetrically arranged

If you are a bit shocked,
and think:
“I would really hate to stick my hand down into that”
it is probably an improved design.