This is an incorrect way to frame the impacts of temperature increases. 1.5, 2, 3C makes extreme events like the one you stated significantly more likely in a probabilistic sense. The ability of adapt is in part driven by frequency of extreme events as much as it is adaptability to specific thresholds. We are already experiencing deadly heat bulb events at current warming levels, the impacted areas and frequency of these events will strictly increase.
I agree, but what we aren't currently really seeing (at least I've not seen it) is a heat dome killing off a herd of cattle or a crop.
That's the sort of event that becomes much more likely if not inevitable as the temperatures increase.