There is no rational reason for Mastodon to limit posts to 500 characters by default.
If the limit was 100s of KB, people who still wanted to divide every thought up into a thread still could; nothing stopping them.
But if someone wanted to post a gigantic essay, they also could, and I'd see a little "More >>" link and I could ignore them faster.
We have decades of history proving that length limits do not make people concise: they just make people post threads.
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