Maybe in the future, cows won't produce methane and we'll just have to worry about land use and the efficiency of raising cows for food. But historically and presently, they produce a huge amount of methane and contribute significantly to climate change.
I also note that the methane isn’t a big problem, cattle methane is probably tiny compared to fossil methane
This specifically is why I replied to you: you didn't know something, made a guess, and were very wrong about it.