Why are people talking about placements?

I too have this question

In what way are they talking about them? It's 5 days away, and a legitimate concern, because no one exactly knows how it's going to ship in live form.....

1. Are Diamond/Plats/Golds going to be in the same placements as Silver/Bronze (There have been conversations about Rioter comments suggesting this season is a hard reset, and doesn't take into account preseason/Season 8. That only New aco%%%%s will by default start in Iron)

2. How Fill is going to affect placements (From the way Riot described Placements, you're going to have to play 50 placement games, 10 per role, before it's over. Talk about taxing an already game exhorbitant system with more games)

There is a lot of uncertainty and people are scared.