When you try to make something acceptable to everyone, you end up with something that no one likes, but will eat if nothing else is available.
Oh, we're talking about Frozen Pizzas here.
To be honest, it's got a bit better recently, but for the longest time frozen pizza, made for the mass market, were just the most tasteless blah flats of doh you can imagine. They were completely flat to my palate.
It's not surprising. I live in So Cal, and if we have anything down here, it's an abundance of Mexican food choices. Wide variety of tastes, textures, and spices.
Then, we have the national chains ala Taco Bell.
I was in Ohio, once, at a client, and they were going to Taco Bell for lunch. They asked if I wanted anything, and I asked for a burrito with green sauce. Now, the green sauce has a different flavor profile than the red. But one person asked "Oh, Green sauce, is it hot?" I replied "No, it's Taco Bell". Taco Bell, with their national market, especially at the time, could not do "hot". They had to temper to the large market they serve.
I don't know much about Ohio, but it's not really renown for its spicy foods.
Mass market frozen foods face the same problem. Part of it can also be the freezing process, but if that's the case, they can overspice it compensate. Airlines suffer that problem because the taste sense is hampered at altitude.
Mind, all that said, worst Mexican food I've ever had was in Ensenada, Mexico. Didn't suit me at all. I had a similar dish in the US, same (blah, bland) flavor profile as what I had in Ensenada. Maybe it's a regional thing. Maybe it was "authentic Ensenada style".
Which is why when people talk about "authentic" food, I simply claim "I like what I like, I don't care if it's authentic".