1. Power Play mechanics barely interact with the BGS. These are almost hermetically sealed off from each other and only impact each other indirectly. So that the government controlling the system and the missions taken within it have almost no impact on the larger picture. Likewise the top down effects are almost non-existent as well.
2. CQC is literally divorced from the rest of the game. The only links are a text badge by your name if you reach a prestige level, a system permit and an a VERY MINOR amount of in game CR earned.
3. MultiCrew is the least efficient way to combine forces with other players in the game whether it's BGS, CGs, Events, etc. Only the pilot gets credit, and the additional power from player crew is only marginal. So yeah, it is just for laughs. And as an added bonus, people who are winged up near your multicrew can get dropped and get temporarily "ghost banned" from the Open galaxy. You can't even use an SRV for concerted ground and air assaults on bases, that should have been an obvious addition!
4. Exploration and the BGS both have no impact on colonization. The forums are more directly related to colonization mechanics (eg requesting CGs) than any other force in the game.
5. Bounty Hunting doesn't impact the security rating of a system. This is static. So the number of pirates to kill is infinite. There is also no tracking or global reporting mechanic at all, just wake detection. So we have to rely on social media to counter griefers, which hampers community policing. Also instancing... ugh
6. Mining doesn't impact the resource levels of a system. Pristine system stay pristine, so there is no need to discover new untapped systems via exploration. Mining, exploration, and colonization should all be linked.
7. Prospecting only gets you mats for engineers and synthesis. It's completely unrelated to mining. Driving over a surface nets you very minor exploration rank, but no additional info about a planet or addition exploration data for sale, for mining exploitation, or for science (unless you count alien artifacts - which are too rare to be considered gameplay).
8. Environment is unrelated to danger or gameplay except under very specific circumstances. Hot planets have almost no effect on your ship unless you are VERY close to a star. All we have for hazards in the game are coronas, neutron stars, jets, hell planets within carbon star coronas, and crashing. To reflect reality and fun gameplay, the galaxy should be MUCH deadlier than this, yet SRVs can drive across surfaces that range between 23K and 1800K without any impacts or differences for the vehicle. Black holes are harmless, they have no accretion disks or jets. Neutron stars somehow have jets but no accretion disks, which the astrophysical equivalent of having torso and feet, but no legs.
9. The BGS is only temporarily impacted by missions. But you can't grow the economy, population, or upgrade station within a system. For this you need to contact Frontier and request a CG... ugh. The galaxy is essentially static with an etch-a-sketch veneer. So the future is divorced from the past. The only semi-permanent thing you can do is alter the text for who owns a system and at most this can have minor effects on PP fortification, and give you access to better missions at that station. But it's much easier to just get aligned with a local faction than to flip the owner-text on a system.
Elite: Disintegrated.