PS - one thing I got recently reminded of… I know I only take this only from shows and media, but there seems to be a fair share of Japanese people whose kanji knowledge isn’t great, either.
A common taunt to those academically struggling characters in shows and manga is “You don’t know that kanji/that word.” And it’s another, seldom-used word that might come up in a test or a text when studying but isn’t needed to, well, just live in Japan. This becomes especially apparent in fiction where the protagonist is slacking on his studies. So, somewhere in the 12 years of studying some people will develop ever greater gaps and might never truly remedy them.
(There are always people who do poor in class in comparison, that’s just reality. And there are widely varying standards between high schools and what they teach you.)
If one learns all that WK has to offer and can keep it somewhat present, you’re doing more than some Japanese people manage. They will still trounce you in speaking that language, no doubt, but I think even the “recommended” sets of kanji need to be taken with a grain of salt. WK does not agree with the government list, never has, for example.