Battery percentage

I want to know why it doesn't show the percentages immediately in the main screen (if the phone is blocked) . Is it so that the "design" doesn't look bad. I really don't see any reason. And then the statement on the main page of iPhone is not true (see picture). Is it really "Just". I am almost faster when I unlock the phone, and that is for my not only "Just". For example, ff I want to see the time on my watch, I don't have locked. I don't see the reason to embed this as an additional function. Then you can decide by your yourself.