Using high quality ingredients feels almost like cheating, it truly makes food taste far better than cheap commercial stuff. In some cases, it's subtle, but in others, not at all. I like doing comparisons, a great example was a few months ago I bought some scallops, some from Peru, advertised as diver-caught, and some from Mexico, which were less expensive. It turned out the Peruvian scallops were farmed, and the Mexican scallops were wild. Unfortunately, the lower price for the wild scallops was probably because they were caught using a drag, a practice which basically plows the seafloor. The superiority of the wild scallops was completely undeniable, there was no comparison. When an animal's meat tastes bland, it's a sign that the health of the animal is not ideal. Sometimes one can see the difference, like with dark orange egg yolks, and dark red wild salmon, both signs of healthy, delicious food.
Typically, high quality food is significantly more expensive than commercial, but prepared food is even more expensive, and that doesn't stop people from eating out. If it's worth paying for convenience it's worth paying for quality, to an extent. Especially because real foods taste better because they are more micro nutrient dense, in many if not most cases, the price for nutrition ratio is better than cheap food.
In the USA, we subsidize commercial gmo grains, and use them to feed commercial livestock, which means people are used to paying an artificially low price for commercial foods. There are many reasons why industry minimizing costs to maximize profit results in less healthy food.
In the episode, he used the best ingredients, he just forgot to do so with the bread too. Of course, finding bread that goes well with the burger is important too. Mainly though, its about the many details behind the one simple concept about using quality ingredients. Last episode was actually an exception to this, though it had content pertinent to this concept as well.

Just because you have the best food quality, doesn't mean it'll taste good. It's not the quality of the ingredients, it's how you use them.

well yes and no,
if you take two chefs of equal skill and knowledge making the exact same dish, then the one using the best ingredients will win out at the end.

Not true at all, its a combo of technique as well. The chefs will never realistically be limited to making the exact same dish because even the same cuts of meat from the same creature will vary slightly. For them to show their true skill they will make their own versions/spin of that food stuff because no one make chicken cordon bleu the exact same way.

Love this episode

It's not only that pickles go well with hamburgers, per definition one needs to have some form of pickles. The missing pickles would have been my first complain.

McDonald’s is too dry. Burger King tastes like grease. So I’ll be Wendy’s!