Yep hard nose bars for cutting in crap. Whether volcanic ash, dirty roadside trees, or the shag bark cedar of my home forest, they offer one less set of moving parts to wear out or bind up. There is a fine line to tread with chain tension though, too tight and the saw is fighting the friction, as well as the chain eating up the bar, too loose and the chain will eat the bottom of the bar nose, and of course, throwing the chain becomes nearly inevitable.
That saw and bar combo, with carbide chain would be fairly common as a breeching/rescue saw with many American fire departments. Stihl used to sell a version of the 460 set up as a rescue saw in their catalog, although I believe it has been replaced by the 500i.
As a secondary tangent, I think the 500i as a rescue saw is idiocy. As much as I love my fuel injected monster, it's a bad choice of saw for the task. A properly tuned and maintained carbureted saw is two, maybe three pulls and ready to rip. The 500 needs two minutes to commune with the machine spirit before it's ready to work. Two minutes idling while people burn to death. And let me tell you, forcing the 500 to work before it's finished it's prayers will not lead to fun times.