Mobius private group was created out of necessity, because FD didn't think it prudent to balance their game.
You wot? Mobius is a commander, who created a private group, as they fundamentally disagreed with the terms of service (ToS allows for friendly-fire) and applied their own moral code (no friendly-fire) where the rules and their policies run in parallel to the ToS. This is fine, as it's an opt-in, invite only group and admission mean you are held to a specific set of Mobius terms, not just the ToS. No problem? it's a player run group and their word is law. But that's what it is.
This has nothing to do with Frontier balancing (or not) their game. It's because Frontier offered three types of experiences, and none of them were considered acceptable, so a proxy forth was created, that entirely relies on commanders not doing something they can otherwise do. Did you know PvP was actually permitted in the apparently PVE only group for some time? Eventually, it was revoked.
Mobius is ostensibly a dictatorship and relies on people following rules, where they cannot be compelled to do so (only ejected). It works for a lot of people? Again this is all fine and I reckon Mobius is a pretty good sort and I sure have no quarrel with them But it is, what it is. A dictatorship with rules. I have no problem with anyone starting a PG with a set of rules for admission and ejection, either.
But PVE as a defacto mode necessarily removes much of what makes player co-op enjoyable. The very thing that ostensibly exists in Mobius. Co-op. A true PVE mode cannot be as the Mobius PG is. Because it cannot prevent action; only react after it. Frontier cannot realistically use that model. So they would, necessarily, have to administratively enforce it. Because they have to prevent it.
Folks will not always grasp this, unfortunately. So will, forever, ask for the impossible (because that specific implementation cannot work as is) and then be confused why it cannot be.
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This means fuel rats cannot refuel, people cannot tea-bag, commanders cannot deploy repair limpets for others. Ships cannot have colliders (with other commander ships). SRVs cannot interact. The list is endless. A vast percentage of the interaction people take for granted in Private Groups goes bye bye. It must. Because Frontier cannot claim it's a PVE mode unless most every aspect that can be used to the detriment of others, is removed.
As they have said; it would become an endless game of whack-a-mole as they remove endless features that can be exploited. And I'd humbly suggest removing endless features would not help Elite in any fashion!
This, is why there's no official PVE mode. Not because Frontier are mean, or incapable, but because it necessitates the removal of virtually all commander interaction that people want to exist. It necessarily has to. Which runs entirely counter to Frontier's design and goals. It's also creating a massively limited fourth mode, in game that already has three.
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Bethesda understands interaction between people is the desired outcome, they're just trying another approach to the same basic conundrum. How do you allow full contact multiplayer, without allowing full contact multiplayer. Answer? You can't. So.. they're just going to make people targets and turn the entire community into vigilantes and let them run amok. Which, ironically, makes sense. Fallout is a post-apocalyptic landscape full of the desperate and the depraved.
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The time for Frontier to have created that PVE ghosted-mode type deal was during Alpha. It's been five years. Trying to shoe-horn that in now would be diabolical. And it would share
no similarity with Mobius' Player Group. Me? I'd rather Frontier solve PG scale and ensure there was a proper permissions model and
delegation of authority for the love of god. Let the systems that exist now, work smarter, rather than trying to stuff everything back into the bottle.