Smartphones with active cooling? You must live in world that's very different from the one I live in.
Also, as mentioned in other replies, your whole point about "overheating and rebooting" is a straw man. Throttling was introduced to address battery aging. Again, a problem that affects every device with rechargeable batteries.
> Apple just has a history of prioritizing design asthenic and they're willing to push the limits on thermal regulation.
Except they do have thermal controls...