I just had a great Supply Raid mission (one of those where you have to tag crates for airlift, in case there's more than one variant) featuring me, the lost, and both Advent and a Chosen. Lots of fun. It wasn't timed (except once Advent tags a crate, which it does at random, you only have one turn to retag it before it is airlifted out of there) so it was a great mix of faffing about at the start countered with having to move quickly later, and of course trying to use the Lost to deal with Advent and the Advent to occupy the lost while you run around and mark boxes. Unfortunately Outrider got pretty beat up (her long move distance meant she was the one running into new Lost) but otherwise I did pretty good, even got the Chosen before she inflicted a single damage. Also, Skirmishers make the best Lost bait, what with how they can move long distances with their grapple book hook and then still have both their actions left.
I'm pretty in love with Skirmishers. They seem built pretty much for how I loved to use the grappling hook armours. It's a shame they don't have a shotgun for that extra "grapple up next to a far away enemy and shotgun them in the face" oomph.
I like the Lost too. It's nice to see some direct connection/consequence of what we saw in the previous game, something original XCOM 2 had a lack off. They also fit in very well with my own imagined post Enemy Unknown happenings, except with Meld and Chrysallids instead of the Stasis-Inducing-Pods.
I'm really wondering if the Reapers weren't called something to do with hunting originally, what with like every other line of theirs seeking to have to do with hunting or whatever. "Stalkers" being a likely candidate, and would probably explain why they had to change it as well, given that their aestethics are a definite... I guess we can call it an inspiration
The only thing that could too this is if Annette turns out to be the leader of the Psiotic Resistance group, but that is probably unlikely. She'll always be in my head canon, though.