One of the great things about Ubuntu Budgie that I have discovered, is that it is indeed very community driven. It was something the team brought up to the community. Yes, this is a while ago, but still… Me, personally, I use Icon Task List instead of Plank. But the team asked, we answered, they listened. So I guess you could say it was our decision.
That being said, we all certainly have the ability to make things better, even if its just pointing out that things aren’t working as expected. But aside from whether or not to include it as a default app, Plank is outside of the control of the Ubuntu Budgie team. However, you may want to comment on the issue here. It is an old issue that has been reported on launchpad it seems, with not much progress made, but every voice only helps to draw attention to it: