Doomfist has the potential to OHKO much of the roster every 4 seconds.
Through barriers.
Also if that doesn’t work, he can launch / CC them and combo them with his hand cannon.
I get that some people want to make Doomfist out to be perfect, balanced and simply a strong DPS hero but you can’t deny the fact he has an OHKO every 4 seconds and that his ultimate ability is a free kill on Ana and Zen as well as any other heroes who lack mobility or invuln