Perhaps folks who have visual challenges.
I'm not blind yet, but damn, my eyes are getting worse every day, and it makes my spelling and grammar worse too. I will send a brief text and explain that very fact and ask for a call. If they refuse, I will undoubtedly cross them off the list. Sometimes, providers continue to text, ironic. Some have reported me to Mr. Number for this, alleging that I am a time waster, drug them, or skip out without paying.