You're going on and on about PVE-changes - just what "major PvE-changes" did you read of? Industry and orefields? This is again player driven content, not for opportunity gamers and new players.
In fact, it may look like a lot has happened on PvE side but those were only minor changes like rebalancing, AI improvements (?), NPC band-aid-changes,...; the big patches were about PvP - still no action to PvE yet.
Atm. Perp is a hardcore PvP-game with just too less players for good wars and industry/market, there are enough PvP possibilities (gamma islands with MCP + terraforming, intrusions, player driven PvP events,..) - but theres barely real PvE content that holds you ingame for longer than let's say a month.
In a sandbox a nice PvE is the basis for a working PvP. PvP-changes alone didn't bring in new players nor hold off older players from leaving (even the contrary at times).
And what would you do with an alliance feature if there's not enough players to make good use of it?
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So putting the whining aside, DEVs already told us that they're working on PvE content after Gamma (+ its hotfixes, hope that part's done now). Maybe there will come some small improvements inbetween like before, but this is necessary too for a stable and fun gameplay (concerning connection, lag, bugs, ...).
Nonetheless, an alliance feature is afaik still on the To-Do-list of AC (not cancelled but postponed).