I see this as a win, I'm sick of every freaking romance story devolving into a harem that always concludes open-ended from indecision.
Why is open-end an indecision?
So, you are saying that anything that goes against the society norm is indecision?
And people aren't allowed to choose more just because society wants them to not to choose as they consider it evil/bad?
If you don't like Harem series, I am ok with that.
But calling the situation being "indecision" is not appropriate.
Since, i believe that even choosing both is part of a decision making, because if any relationship is indecisive, then the relationship won't work, be it mono or poly. And if all the involved party accepts the situation, then why the 3rd non-related has to bother with them.
Plus, we only read a fraction of Manga Series released in Japan since majority don't get translated.
If you compare the overall release of Manga series in Japan, then True Harem series (non-hentai) make up for like less than 5% of the works released.
Majority are either Non-Harem or Fake Harem (aka., those that end with no Harem end).