1. FATEs rescale if you pull then reset them. Got to learn (some) mechanics to solo them though.

2. CEs scale amazingly, and all of them are soloable except Calamity Bound. Provided you know and can do the mechanics enough, you can solo them all relatively quick.

The whole thing is designed with solo play in mind and was future-proofed already. I love just being the last person in the instance soloing everything. It shakes things up a bit.