I want to specify one thing here, which does not invalidate anything of what you said, but it does make your post pointless.
This thread, after about five pages, has unfortunately degenerated into the thing I feared the most and which I tried to stop when I could, but apparently failed.
That is, it started to turn into useless bashing of tropes, followed by more useless apologetic replies, usually made of claims like "I enjoy the thing" or "it makes money so <some kind of consequence>" or even "isekai is always garbage so anything you said has no meaning".
To quote the post opening this thread:
"Now then, this thread is for Collecting Tropes you find issue with, Brainstorming ideas of how to potentially deconstruct these tropes
and get some cool concepts out." (emphasis mine.)
This thread is to take a single trope, look at it and try to get something that
might be more interesting than what authors usually settle with.
This place is exactly where you go beyond things like making money, or demand from readers or anything else. While it is true that subverting a trope for the sake of it does not make the story more interesting, it is also true that being apologetic of the status quo for whatever reason, even valid ones like some you raised, does nothing but make us unable to
discover potentially interesting concepts.
When analyzing a trope one
must go against everything built on top of it no matter what, even if it makes money or if the process makes the result less interesting or less believable.
Both the people that simply complain saying "why are authors..." or anything similar without providing different point of views, and people that unilaterally stop any attempt at discussing tropes by, for example, the genre is built around those tropes and you can't just change them,
are posting in the wrong thread.
I repeat, you raised valid points: authors and artists are people too and need to survive, so if they get to have a job by bandwagoning then they should definitely jump in; if readers enjoy certain contents and are more willing to read or watch works with said contents than those without, then it is reasonable for editors and producers to provide these contents; and so on and so forth.
However,
this is the wrong place for that.
As a side note: your complaint about national identity being reduced to food should be directed to authors: they are the ones using nothing but rice instead of, say, their architecture.
And guess what? Talking about this matter falls exactly in the intended topic of this thread! How can authors convey the japanese superiority without resorting to food?
A possible solution that is easy to use in works is with weapons. Of course I know about the billion fold steel meme, but there are things beyond that.
For example, you know those very long katanas you see in cringe weeb photos, the "I studied the blade" kind? Those kind of swords were used by cavalry and Europe never had an equivalent weapon (that I'm aware of, at least), so an author can claim superiority and even be a little more historically accurate than isekai normally are.