PvP in my book are also BGS wars and minor faction manipulations. It would be interesting use the same logic here

. ... It would be so fun when one side will murder security ships directly before defender eyes and they will be not able touch them
And yet, this to actually happen is very slim today. As even IF everyone played in open, there are quite alot of things to consider
* Time zones, players play in different time zones, and it makes sense to assume that most player groups exits constist of member that are in the same or close time zone. Of course there is some player groups that are defined by other reasons, like Yamiks that collected player from all around the globe to be the first to hit 500 members limit. OR the Fuel Rats, that operates a 24/7 operation on all 3 platforms.
* Regional instancing, here we have the likely hood of some player from Europe getting instanced with a player form Australia. This is less likely to happen, this have been observed before by players in places like Australia have noticed that having their VPN active (that terminates in North America), get instaced wit North America players instead of their Aussie friends. Dedicated instance serves would not do anything to help with this, as these would typically be placed around the word to be "close" to the players.
* Cross play, we have 3 platforms today, PC, XBox and PS4, at the moment we do not have cross play.
* Firewall/Network issues preventing player to instance with other players.
So even here, we can clearly see that this is going to be ALOT of IFs that need to be true for two players to being able to see each other.
It is more likely to see other player at event location like Community Goals or really popular places like Founders World and some engineers.
So I find that scenario to be pretty moot in the end, as the likely hood for this to happen to be really low, just as it is rather unlikely today to find another player in a random conflict zone. This increases if it is two player minor factions that is at war, but that also requires that these player groups are on the same platform, similar time zones etc, etc.