Skimming through some recipes I searched, it seems it is mostly all purpose flour and a ton of oil to make it flaky. It seems to be in the "unhealthy" camp assuming carbs and sat fats are unhealthy.
Also in the cheap camp considering the ingredients are cheap and making it does not seem too time or equipment intensive.
I find working with dough to always be complicated, but the recipe itself seems simple enough, so it might qualify as basic too, relative to other recipes.
Low class is ill defined, but assuming it means it is popular with poorer people due to the lower cost of its ingredients and preparation, then it might also be true.
"Basic" is clearly not a useful adjective, when a grilled cheese sandwich can be made with a variety of different ingredients some of which are easily available in most parts of the world, and some are not. Certainly you can make a basic grilled cheese sandwich, but it's a logical fallacy to leap from there to "all grilled cheese sandwiches are basic".
"Low class" is again highly ingredient dependent. A grilled cheese sandwich made with some "rare" sourdough bread, irish grass fed butter and 3 kinds of artisanal cheese from different parts of the world is just as much as grilled cheese sandwich as one made with wonderbread and slices of american "cheese product". It's a similar logical fallacy: just because you can make a "low class grilled cheese" doesn't imply that "all grilled cheese sandwiches are low class".
"Cheap" is also covered in a similar way.
Unhealthy I will generally concede, other than to note that our ideas about what is and is not healthy or unhealthy food shift a lot over time (and often loop back on themselves).
Also in the cheap camp considering the ingredients are cheap and making it does not seem too time or equipment intensive.
I find working with dough to always be complicated, but the recipe itself seems simple enough, so it might qualify as basic too, relative to other recipes.
Low class is ill defined, but assuming it means it is popular with poorer people due to the lower cost of its ingredients and preparation, then it might also be true.