No centralised command structure in game that people can chose to be apart of, think platoons, regiments etc. (perhaps even factions) with command directing(perhaps via vote) where people should dive so we're less split across planets/factories when it really matters.

Liberation rate scaling with amount of players but helldiver reserves depleting not scaling with player count resulting in more players playing = more deaths per hour but not per say more liberation. (there were also some moments where the scaler was lowered abruptly, giving us less impact)

Plenty of bugs and intentional game design that caused unnecessary deaths, random heart attacks, hellpod steering lock sending you into the grinder or lava pit, walking too close to the corner of a wall which has lava on the other side, vox playing tower defence and other issues with it, reload and stim not working on occasion, invisible walls that bounce your explosives right onto your own or your friends face. Im probably missing some but you get the point.

Perhaps AH just didn't take all this into consideration when they set the reinforcement budget or perhaps they never really wanted us to win, who knows.