I've been saying this for a while.
I come from Gal Civ 1, and while I understand it had years of polish Gal Civ III has not, it feels like 40% of the tech tree is just ... gone.
1d - 2 d - 3d - 4d phasing
I keep saying I'm going to fire up Gal Civ 1 and play a game just so I can flesh out a more complete list of how we've gone backwards in technology while advancing into the future.
Nothing like losing options in sequels.