I suppose for those who can't spare the 0.5 seconds it takes to read your print it might seem an inconvenience.
I'm sorry, but it's just unnatural.
You are holding it and using a finger to swipe the message, and it would be natural to continue holding the phone in this manner as you type your reply message. Instead, you must rearrange how you are holding it to put your thumb over the home key, and then rearrange again to start typing your message with your finger.
I get that your response is somewhat tongue-in-cheek, but yes, when carrying on a texting conversation where 15-20 messages might be sent over a 5 minute period, it is extremely annoying to continually have to unlock your phone -- even if each individual delay and thumb-gesture is minimal.
Just does not make a lot of sense to completely remove an option that people use for no other reason than thinking you know better.