In uni, maybe. But my experience in middle/high school was that hitting the minimum word count was much more important than actually good writing.
And having a topic sentence, and sometimes even deliberately using rhetorical devices like parallelism that a LLM detector would flag up.
The concept of word count in high school was bonkers. Knowing my teacher wouldn't check, I wrote a dense line with a lot of words, using small print and small words, and then used that as my baseline (so let's say it had 20 words). Then if I needed 200 words total I'd write ten lines, knowing full well that other lines of text would only have 10-15 words.
Cheating? Maybe. But it's a silly metric to begin with, and obviously the teacher didn't actually care about the count because I got an A in most of my essays.