The thing is, if you’re looking at TikTok etc then the format lends itself to people chucking loads of stuff together and producing something quick and easy that goes in a video. That’s not necessarily how most Americans eat and I’m not sure anyone is claiming it’s fine dining.
I have American recipe books and have watched American cooking programmes that don’t have a single processed ingredient in sight. Equally, Jamie’s 15 minute meals and Delias cheats were almost all assembly and little “from scratch”
Volume vs weight- there are pros and cons. Cups are actually pretty clever because you don’t need specific equipment, if all the measurements in a recipe are proportions of a cup then the size of the cup doesn’t matter, the recipe will work with a mug, a coffee cup, a jug, a measuring cup or a jam jar- it doesn’t matter. But a weighing scale is more accurate when accuracy matters. Oil in cakes makes a lot of sense too- oil keeps in wider temperature ranges than butter, not melting everywhere when it’s hot and not rock hard when it’s cold. They make a different end product but it’s not rubbish, it’s just different because of the availability or practicality of ingredients.
I don’t like the idea of jelly as a side to savoury foods, in the same way I don’t like the idea of eating chicken feet. But then I’m not sure how many New Yorkers really like the idea of black pudding either. It’s just different, if they didn’t speak English you wouldn’t be batting an eyelid that a massive country thousands of miles away does things differently to us.