Tool specialists will be able to teach us about local micro-hotspots or ~zones.
The base is:
a) Sintered vhm bits are more tolerant to heating than to thermally evoked tensions breaking up their microgranular texture.
b) In many cases you want to protect your workpiece against damage by a tool that is hotter than the workpiece likes. There you have to observe the limits of what your tool likes - and what shortens its life cycle circumference.
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Before posting I did a google search for sintered cutting bits and 100% of the results mentioned diamond. But that is all the research I did.
I’m just an amateur but I thought carbide and coolant (and the combination) were standard practice in industry, so 
. They even have carbide tools with channels for coolant. If there is a scenario where it’s to be avoided, I get the feeling it’s not common.
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No, but ABS fumes will definitely throw you into the hospital because it produces poisonous gasses like cyanide. Theses plastics don’t vaporize they just melt leaving behind residue. PVC will produce chlorine gasses which will rust your laser head components. Its easy to test this with a flame torch.
For your health only use spindle motors to cut plastics.