With all this talk of what bad players would do with DT and OHKO, people seem to not be considering what GOOD players will do with them. Good players aren't going to spam OHKO attacks in the face of a stronger opponent. They will bring in their OHKO Pokemon where it will force a switch and then use the free turn to attempt a OHKO. 30% chance of success is not bad odds. It's a risk-free way to potentially bring down someone's Pokemon without ANY prediction.
For example, say a Milotic is switched in on an Infernape. The Infernape user switches to Lapras to absorb Surf. Milotic can't do anything to Lapras, so the only real option is to switch out. This gives them a free chance to Sheer Cold. No risk whatsoever. They have a chance to take out whatever you switch in, without having to worry about prediction. If it fails, oh well. You can just switch like normal, and bing it in again later.
With DT, I point out Umbereon as a good candidate. With Wish or Moonlight it can keep itself healthy while it DTs, and then it can Wish pass to, say, Yachechomp. HAVE FUN. And this is just a single option. Sure, you can set up against it, but whether it actually pays off will be totally up to luck. As a competitive community, we should do what we can to reduce luck and ensure the better player wins as often as possible, rather than the RNG.
For example, say a Milotic is switched in on an Infernape. The Infernape user switches to Lapras to absorb Surf. Milotic can't do anything to Lapras, so the only real option is to switch out. This gives them a free chance to Sheer Cold. No risk whatsoever. They have a chance to take out whatever you switch in, without having to worry about prediction. If it fails, oh well. You can just switch like normal, and bing it in again later.
With DT, I point out Umbereon as a good candidate. With Wish or Moonlight it can keep itself healthy while it DTs, and then it can Wish pass to, say, Yachechomp. HAVE FUN. And this is just a single option. Sure, you can set up against it, but whether it actually pays off will be totally up to luck. As a competitive community, we should do what we can to reduce luck and ensure the better player wins as often as possible, rather than the RNG.