This is important because of the need to include links
Here are a bunch of the flags I've sent in the past few weeks. All of the links and names have been anonymized and don't lead anywhere. Virtually every one has been painstakingly edited down to fit in the character limit, and I left out additional examples from multiple because I couldn't fit them. This is an enormous waste of time, and makes it harder for me to provide moderators with information. Judge for yourself whether these are even borderline too long.
Also note that these take advantage of the mini-Markdown support in flag text as well as relative links and short-form links wherever possible to provide a clickable link in the shortest possible number of characters. If I didn't know how to do that, I'd be able to fit far less into my flags.
500 chars: Bad edit reviews: user1234567 isn't rejecting bad edits—ex: 1 (changes meaning, breaks formatting), 2 (changes meaning, makes text not match screenshot), 3 (adds unrelated tag), 4 (makes grammar worse), 5 (borderline, I'd reject—text in image is "favorites", not "favourites"). Consider a review suspension
499 chars: Bad LQA reviews: Abcdefghi is voting to delete a large number of code-only or short answers. Ex: 1, 2, 3, 4 (wrong, not NAA), 5, 6 (possibly a borderline dupe, but no comment to that effect). Please consider a review suspension to inform them to only delete NAAs.
480 chars: Bad edit reviews: Abcdefghijklmnopq isn't paying attention. Examples: 1 (reject: puts a space in the middle of method name in the title), 2 (reject: misuse of
code formatting on things like "OpenCSV"), 3 (reject: adds unrelated tags). They've also failed an extremely obvious audit. Please consider a review suspension.
498 chars: Bad LQA reviews: Abcdefghijk is voting to delete a large number of code-only or short answers. Examples: 1, 2, 3, 4 (caught 1 of 2 typos in the question), 5, 6 (contains a guess at an answer, albeit with a follow-up question). Consider a review suspension.
500 chars: Bad suggested edits/reviewing: Abcdef's suggested edits primarily add
code formatting to things that are not code. Ex: 1, 2, 3, 4, 5, 6, 7. Please consider informing them to stop and/or suspending some reviewers who approved these.
500 chars: Bad edit reviews: Abcde—1 (approve: fixes broken link), 2 (approve: code-formats code), 3 (reject: removes code format from 2nd code block), 4 (approve: fixes copy/paste error), 5 (approve: improves format), 6 (approve: better tags/format). Consider a review suspension.
499 chars: Bad edit reviews: Abcdefghijkl—1 (reject: just adds space), 2 (reject/improve: adds
code formatting to non-code (subselect)), 3 (reject: no improvement), 4 (reject: incorrect tag link), 5 (reject: adds improper indentation), 6 (changes answer to this)