I think you are being a bit cynical , about this author Dayo. Based on ^ its quite obvious the author attempted to lengthen the story by filling in every hole in 15+, compared to this manga which rushed through things forcing the reader to assume things, or as if we just tbh missed "part 2" chapters. But its still an attempt at improvement and that shows something.
But this manga's plot while not absolutely unique is intriguing, while you can say the stuff happening here is cliche, that's being presumptuous. As people have said we can assume there will be the same plot of arranged marriage we see in normal romance, but A) It hasn't happened and you assuming the plot will be cliche doesn't make it cliche, stop taking your anger out of an undeserving author. B) This isn't cliche in Yuri, and maybe I've missed the arranged marriage manga's but I've read most manga's posted for the past 2 years. Also if this manga improves as it progresses I don't think that initial skips would be bad at all rarely do we see manga's focus on the romance especially in Yuri, most of the manga's effort is spent on becoming a couple (Think Lily Love, Always Human (good webtoon go read it) Say I love you (Norm Romance but gets the point across)), and if we were to see a manga built on the romance overcoming the internal and external problems it'd be a masterpiece. But in all honesty I don't see that happening I'm just being optimistic.
And for 15+ yes it slow but its not predictable, and if you think it is I'd love to see your foresight in words because as far as we've seen the only thing for sure is that they will become a couple.