Zilmax impacting beef flavor?

Sadly, no it will not. Most people buy beef by price and not taste. In fact, I will go one step farther, most people today cannot even remember what real beef tastes like. So much of what they have bought is from the major beef producers, and the taste has been slowly eroded for so long, they probably can't tell the difference.

Didn't we go through the same thing with pork?

It's the new normal, unfortunately.