In the last few episodes, it's been established that phasers can poke holes in people / Control, but not vaporize the entire body. TOS / movies / TNG / etc... suggest otherwise. Although I'm pretty relaxed about the liberties Discovery takes with canon, this one seems a bit more egregious. Just registering my complaint! On edit: this was also missing from the JJverse films. It would've have taken care of Khan pretty quickly, though Kirk would have lost out in the end.