Because people dont. We saw that in my other thread, "Is it useful to write out my identification steps? People respond to such information in every way except using it to verify an ID.
Now, the particular Sargassum observation I referenced has since gone to RG, but I find that it’s rather hit-and-miss. Much of my communication on this forum has been related to trying to encourage people to overcome their intense fear of making a wriong ID and have more confidence.