The beyond burger is actually fine for that segment. I've had a few. They are alright. But I don't crave a beyond burger any more than I do a big mac. It's just bland fast food to me. I'll munch it away if I'm hungry and there's nothing else but it's not particularly good or excellent.
It's miles apart from a good quality premium burger that is made of ground meat from a good cut of meat. You grill it medium, medium rare. Grease dripping all over the place when you eat it, etc. Much harder to compete with that. Now that's something I enjoy eating once in a while.
The problem is that things like the beyond burger are somewhat better than a cheap fast food burger but not really in the same league as a really premium burger. But they are priced like one. So that narrows down the audience to people that actually like meat but feel guilty about it and want to pay more to eat less of it. These people exist of course but it's a relatively small group of people. I just try to eat other things than meat to cut down on meat consumption. Works fine for me.