Comment by adrian_b
Actually many ridiculously expensive "flagship" smartphones do not have DisplayPort and some do not have even USB 3.
The chances to find DisplayPort in what nowadays have become medium-price smartphones, i.e. $500 to $600, are about as good as finding DisplayPort in a "flagship".
Which flagships (other than Apple), don't ship with display output?
AFAIK Samsung, Google and all major Chinese brands have display output on their flagships.