The weather and the gacha rates are both kinda iffy, so if I'm a meta-chaser, do I really need to pull for the collab?

It's your choice. Pull if you want to.

The collab isn't that great performance-wise.

You can think of the collab as a toy for veterans and skip it if you want. As for Nian, if you don't play Rock-Land often, there's no need to pull for her.

This might be meddling, but... I heard that Alternate Orchid and Special Talulah are a bit special, and Yuki is supposedly OP)) And more importantly, the collab banner<<No one knows when it'll rerun, so it's a true limited banner...? I'm still new, so I'm not entirely sure!! Hope you get lucky with the free tickets and pull everything you want! (゜∇^d)!!