it is a shame that pvp gets so little new content but i think the reality is they could make a really good new pvp game mode or zone or something and it's really well designed with a tonne of thought and time put into it but in the end only a small fraction of the playerbase will actually play it
it's not even really a case of whether or not it would be a profitable venture for the team, but rather it just makes more sense for them to have the highest guarantee that the largest amount of players will check out the new stuff they've made - which, that content will inevitably be pve zones and features intended for players who like playing through those zones
pvp content is just so niche in the grand scheme of things