Not with exploited PS5's and transferrable hacked saves now being a thing. Currently the only way to get into a Warzone lobby with 0% hackers is an Xbox-only custom match. There was like a two month window after Cronus got nerfed on PS5, but now the floodgates are open. Very early days, but be fully aware, the swamp is rising.
I'm all for larger player pools and cross play, but only if the lobbies don't become script stomps...which requires locked down systems.
That being said, there are generally far less cheaters/hackers in Halo/Gears than CoD.