ygo pro 2 was with it before it discontinue and it work perfect fine and they said it was easy to script it soon there will be new simulator
For having tested myself, no it was not « working perfectly fine » and I can think of a few case that were just working when it should not (random ex, you could use the lizard while you had Yang Zing Creation face up on your field, which is wrong)
As for the « New sims », I guess you speak of Omega, their team are fully closed source, so it is impossible for anybody to even check if they got it right (I don’t even recall it being played among the few « tournament » they made on twitch, and being in « closed beta », nobody can even test it)
If they got something right, they are free to propose it to the other teams, like that there is nothing we can do beside trying to find a solution on our own
If you want, you can ask them yourself why they are not proposing their correct Clock Lizard upstream (Fluohydride being the original fork)