There's another benefit of using proper grammar (and punctuation): It helps people whose first language isn't English. I grew up in a mixed-language household,

There's another benefit of using proper grammar (and punctuation): It helps people whose first language isn't English. I grew up in a mixed-language household, and I struggled a bit with English (when I was very little). I relied on the rules of the language to understand complex sentences. Deviation from these rules may seem like no big deal to people who have internalized the language on a deeper level; but for people who are not as comfortable with English, the rules are very important.