I think the point being made, is that when the authors are frequently retconning the cababilities of the characters, there is little internal consistency to be had, and without that internal consistency upon which you can compare the capabilities of those characters, all of them feel the same as "Batman just having whatever is needed [as] a narrative conceit". A franchise with sloppy continuity makes everything feel like deus-ex-machina, and thus no superhero comic books are a good standard to benchmark against for what feels consistent; Batman isn't that big of an outlier if the measured capabilities of Spider-Man will be retconned on-demand anyway.
While I think that's the argument being put forward, at least on the Marvel side, I think most superheroes had pretty consistent and well-defined capabilities at least when I was reading them from ~2000 - 2014, and when they changed it was mostly organic throughout a story that justified the changes rationally, with big retcons being inconsistent for most characters for much of that period. They could certainly have been more consistent, and IMO that would have been better, and big timeline "resets" like "One More Day" were mostly crap. But I think by and large, most superhero comics did give them better defined abilities than Batman's unlimited offscreen preptime and nigh-infinite foresight.