I don't disagree with any of that -- was just trying to answer the 2 questions that you asked.
If you turn off auto-correct it will turn it all off.
The only suggestion I can offer is that when I type quick look the suggestions bellow the message display "quick look" (in quotes as shown) and if you tap that it won't capitalize. That assumes that you (unlike me) notice it in time. I end up backspacing and typing it in lower case again, at which point it accepts it. Sorry, I don't know of another way to "trick" it.
This is primarily a user-to-user support forum; other Apple users like you.
If you want to let Apple know, maybe try the Messages or the iPhone section of Product Feedback - Apple