I expect other pressures have changed, too. The first thing that comes to mind is that bitterness in plants is often a marker of toxicity; one of the steps in this quick and dirty edibity test for wild plants, for example, discards bitter ones. If a particular gene variant made a few harmless plants unpalatable but also made accidental poisonings less likely, I can see it being a net positive to foragers.
In an agricultural setting, where a few known-good plants make up most of the regular diet, the opposite might be true.
I expect other pressures have changed, too. The first thing that comes to mind is that bitterness in plants is often a marker of toxicity; one of the steps in this quick and dirty edibity test for wild plants, for example, discards bitter ones. If a particular gene variant made a few harmless plants unpalatable but also made accidental poisonings less likely, I can see it being a net positive to foragers.
In an agricultural setting, where a few known-good plants make up most of the regular diet, the opposite might be true.