The tone of "Hard fall detected" is good if you're developing a product where precision and accuracy matters most such as in the military or in some high stake

The tone of "Hard fall detected" is good if you're developing a product where precision and accuracy matters most such as in the military or in some high stake business situations. But the Apple Watch is a consumer product. Also, the watch did not detect a hard fall. It merely saw signals that suggests it could be a fall. So "It looks like you've" is more accurate and friendly to consumers..