To which my first thought would be, but does it speak to lesser character development, or just the same? If its just the same then its not a valid criticism.
See notes about Superman and Wonder Woman - when
what you can do becomes more central to play than why you choose to do it, there are media other than RPGs that are apt to handle it better.
Which is why I always suggest with greater power comes greater responsibilities.
Responsibilities aren't
character. Adding more tactical concerns does not counter my point.
High Tier should add running a Stronghold.
Epic Tier should add running a Country
I submit that those would be better served with their own entire games, rather than something bolted on the side of a small-group tactics and action-adventure game like D&D. Especially when the story that personal power of violence naturally leads to power over the people of a nation is... fraught.
It might be difficult to write good stories with incredibly powerful characters but its certainly not impossible, far from it.
Nobody said is was impossible.
The thread asks a question - Why do higher levels get less play? Among the answers may be that writing compelling content that calls for an RPG at that power level is hard. That it isn't impossible doesn't change that it is hard, and doing much of the same thing is pretty easy at lower levels.
Superman fighting Zod (or whomever) is just standard fare.
But if the stakes are the survival of the Earth then we have scale.
As has been noted by many a viewer of long-running programs, while one might assume that even greater risk makes a story more emotionally resonant, it often doesn't. The game of having to one-up your own stakes to hold interest is where "jumping the shark" comes from, after all.
If the stakes are Superman has to choose between saving the Earth and saving Lois then its also personal.
But you have probably already told that story several times over at lower levels - Lois or the innocent bystander? Lois or the innocent bystander orphan child? Lois or the entire Daily Planet building? Lois or the city? Lois or the country? Lois or the world? Lois or the Universe?
It is... kind of repetitive, and after a couple of iterations doesn't reveal anything new about Superman, as it isn't a fundamentally new question, especially when Superman never seems to fail to save both anyway.
That's what I mean by it reducing to a tactical exercise. We already know what Superman will choose - the only question is how he manages it this time.