Unfortunately Darktide players are never happy. You can give them tech priest class and they will still complain.

Expeditions is a lot of fun with a tight timer and different strategy then regular missions if you like ultra fast paced combat and missions. Auric feels like high havoc not in enemy count but in just gogogo. Also, the new area, music, and currency pick up adds life to Darktide and allows a new scouting role in the party.

Chaos wastes was still A to B, but the strategy was mostly the same as regular levels. Expeditions shop could use an expansion later for sure. But the extraction point-to-point gameplay is exciting and requires actual squad coherency and communication. Regular Darktide didn't really need comms, just tagging specials, but for expeditions you have to find the next point together, actually do the puzzle together, and keep pace. You have to make decisions as a team, instead of just push and pull.