I've heard the fan kick in on my F350 and have other other trucks I've owned. But, it doesn't happen often and the loss of power has always been minimal. The race cars/trucks/etc all have electric fans, and much larger radiators and more oil cooling.
The last time it happened on the F350 was during the big heat wave and fires in Colorado (June 2018) and I was pulling our 5th wheel up and over Monarch Pass. We got to the summit a little after 5 pm so it was the hottest part of the day.
2005 V10 with 4:30s, all new fluids, new belts, hoses, etc., plus a clean condenser and radiator.
The fan only came on once for about 20 seconds 1/2 way up.
The entire trip was hot. But the fan only kicked in once.
Here's the elevation profile
FWIW, all the other trucks shown in the foreground of the photo were mutual aid Firefighters heading home to Oregon, after spending 3 weeks in Colorado. Every crew truck had a gas engine.