Great invasions feel immersive, everyone working together, even the guards at these places no longer attack the factions.
Yet they don't let u invite the other faction to participate property? The stragglers who wish to gank would be dropped in 2nds by the participating raid.
Instead you have one faction getting griefed by a handful of the other, with no guard support at all.
Am I a whiner: perhaps but whatever I recommended in legion to allow the factions to group together under certain circumstances this seems logical.