Well here in sunny Florida summer is 6 months of the year. Of course I have AC, but I do like the feel of warm/hot lather generated in my small Moss scuttle.
However, I went back to cold water after half a decade of hot and I like the results a bit better with the cold water.
The bit about the whiskers cutting more efficiently when they haven't been softened with the hot water seems to be legit to me. YMMV.
I've been tempted to go back to hot for the luxurious feeling, but I'm going to stay with the cold for awhile longer.
Takes less time too. I know a lot of y'all like to take your time but after 58 years of shaving ....