Himawari has grown a lot on me as a reader. I understand why the author decided to take a break from the main couple (Who are obviously pretty much tip toeing around confessing to each other) to focus on fleshing out her character first.
I really feel that once this arc is done, author will feel free to step on the gas in the last arc to wrap the story up.
When will all that happen, I don't know. But I would love an anime of this for example