Parasitic game feature.
Examples of mechanics that do not enhance the base game, but are underdeveloped branches that do not enhance from the core game features:
Powerplay
Multicrew
Squadrons and no LFG communication tools
Thargoids and disconnection from base game (no crossover with weapons)
Fleet carriers and no authentic player economy
Materials gathering mechanics (repetitive relogs required for reasonable progression rates)
I could go on, but I predict you would mistake my enthusiastic data collection as emotional.
CQC
Ranks
Faction Megaships