I see your point. If she had done a strand test by coating her hair with relaxer, then, after 5 minutes, looked up and realized that strand was missing, she wouldn't have done the rest of her head. BTW, never a better time than to use this smiley:
But I'll bet you 100 more keystrokes that MOST DIY relaxer users don't do a strand test every time -- especially if it's a brand they've used before.
I really sympathize with this lady.
I don't do strand tests either but I wouldn't go blaming someone else because all my hair fell out.
I don't sympathize with people who don't follow the rules.
If you don't want to follow directions you have no one to blame but yourself.