Why are you moving the goalposts? The comment is specifically referring to capitalisation, not all grammar, and punctuation wasn’t even mentioned.

I have absolutely zero difficulty parsing uncapitalised text. Most of my communication is and has been uncapitalised for the past 20 years. Including in professional context (Slack, git etc). If you’re struggling, it’s because you’re lazy, not because it’s difficult.

IRC is not a book. It's spoken language in written form, not written language. There's not always full sentences or paragraph structure. Seems like this distinction has escaped you.