my saw is a Husky 61 and it has had a hard-nose on it since new, back in 1993. I've never noticed it running exceptionally hot. It gets hot but it is usually when I stick the bar full depth in a 5' red oak and rip its length.
I've had roller tips before. Over the years, I've owned "pro" poulens, macs and sears(various manufacturers) Usually it was the tip wearing out that caused me to scrap the bar.
When I "moved up"

to the Huskey, it was recommended that I use a hard nose. I did and have sawn worry free ever since. I've not noticed heat because of it, loss of power or stretched chains. The sprockets have lasted as long as any sprocket I've ever used and I've never had any clutch problems. I keep a sharp chain and it cuts like hot knife in butter.
Actually the only heat I feel is when the exhaust is crowded against the log. Man! That gets hot on my hand. I have run the bar oil out before and the bar got hot, but, I think any of them would without a lubricant.