Sometimes they are! I use the expo docs as a human all the time. Some project however seem to really "minify" their docs and are less readable. I'm not quite sure how minifying really saves space as it seems like they are just removing new lines as the docs are still in markdown...

Good for humans example: https://docs.expo.dev/llms-full.txt

Bad for humans example: https://www.unistyl.es/llms-small.txt