I don’t know, I think it’s the mix and intensity of spices that they use, maybe?
And we agree on the idea. I’m not vegetarian but I’ve long decided that vegetarian-branded food should be judged on its own merits as food, not as “adequate replacement”. Like: is this veggie burger yummy, do I enjoy eating it? That’s the question, not “is it a good enough approximation to meat”. If I want meat, I’ll eat meat.
So (good) beef, chicken, veggie burgers: I like them because they taste good. Beyond meat burgers: I don’t like them because they make me feel yucky afterwards. That’s all.