Nope - not as far as PvE is concerned really, not even close to being comparable to PP.
PP does not duplicate Squadrons and BGS - that is a fallacy.
In general terms you and others expand and sustain your faction / Power. I think both do that so how is it a fallacy comparing the two and how you achieve that?
In Powerplay this is achieved doing a few (2 or 3) activities repeatedly (the 'grind') over a number of weeks.
In Squadrons + BGS you use the entire game to do the same- that is, trade, smuggle, missions (fetch, carry, kill, base raid, recovery (space / surface) megaship based missions, murder, war / civil war, elections, retreats and so on.
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To fortify:
(PP) grind haul x number of control systems
In Squadrons + BGS you use the entire game to do the same (i.e. keep your faction healthy to stop a retreat state)- that is, trade, smuggle, missions (fetch, carry, kill, base raid, recovery (space / surface) megaship based missions, murder, war / civil war, elections, retreats and so on.
Remember currently its impossible to drop a system in PP without going into Turmoil. With the BGS you have per system retreat.
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Expansions (PP)
You grind kill or grind haul (depending on ethos). No choice in how you achieve it and it has no end.
Squadrons + BGS- After using the entire game to trade, smuggle, missions (fetch, carry, kill, base raid, recovery (space / surface) megaship based missions, murder, war / civil war, elections, retreats and so on to push your faction = > 75%. After x days expands into the nearest suitable system.
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To prepare (probably the most different).
(PP) grind haul to a location hoping 5C don't outgrind you over a week. Hopefully you control where you expand to, otherwise 5C do it for you.
Squadrons + BGS- After using the entire game to trade, smuggle, missions (fetch, carry, kill, base raid, recovery (space / surface) megaship based missions, murder, war / civil war, elections, retreats and so on to push your faction = > 75%.
Squadrons + BGS is better mainly as no expansion penalizes you- no 5C to worry about (but thats slightly off topic).
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I'll admit scales are different (a bubble in Powerplay consists of many systems) and that PMF backed factions are smaller, but the gameplay is much richer for a PMF squadron than pledges in Powerplay as I've detailed above. In addition PP Powers have little or no lore to keep them going, while Squadrons and PMFs are supported by players and FD.
PP does not duplicate Squadrons and BGS - that is a fallacy.
So from the above, what gameplay is lost if Powerplay becomes Open? Squadrons + BGS obliterates PP currently as it stands feature wise. Its almost embarrassing comparing the two and inferring they can actually be compared because without an extra dimension Powerplay is two dimensional in comparision in PvE. 2 or 3 tasks v the whole game?
Now imagine all the Powerplay points above framed in an Open only context. Suddenly Powerplay is different and offers a new twist that a multi-mode Squadrons + BGS combo does not. Those linear game loops are then complicated by other players. Powerplay becomes in essence a multi arena dynamic battle.
False - CQC is not open only, it is a separate environment period and was like that from day one.
But you have to shoot other players and be shot at. Its not bot based.