Except no it's not, because you have to be an idiot to get heatstroke by purposely exerting yourself in conditions where heat stroke is likely.

You can very easily avoid heat stroke by not engaging in physical labor in the hottest hours of the day & drinking enough water, hence why the "siesta" exists.

Now that we have shit like air conditioning, the idea that heat is this super deadly thing is just laughable.

By contrast, cold is very quickly lethal to anyone who lacks serious shelter and heating, which is why cold kills 20x more people than heat