These days, with high-power cutting tools also for cooling. If you have a 50 HP saw, that energy has to go somewhere, and it doesn't all go into the dust and get carried away. If carbide blades get too hot, the solder melts and the brazed inserts fall out, and for steel, carbide and diamonds, the hotter they get the softer they get and and the faster the tool wears.

And other than the cost of the tools, there is one thing harder to drill than a rock, and that's a rock with the previous drill bit's carbide insert stuck at the bottom of the hole!