Expeditions is really worthless if you play it for resources, or leveling, also, it got tons of bugs, not only this, it is really waste of efforts like the castle is just a decoration, add to all of this, it is not really a PvP that players were asking, it is not PvP at all, it is just like any adventure, just the battle system is different!
Also, players will need a lot of population to support it! the weapons production is really boring and stupid. (personally, I was able to play it after I reach level 64 and got 23K pop, I can say it is really hard to play it together with adv before that).
Anyway, you really need to ask BB first why they ignore expeditions, they almost do nothing to fix bugs, ignore all suggestions about this part of the game, also they add nothing to it, like buffs, generals or anything else related, then if you got answers, you can try to get answers from players then.
FYI: I'm playing Expeditions (level 25 atm) and I really see it most part of the game that you have fun! if you looking for exp or resources or any "benefits" it is not the place you looking for, if you need play for fun, yes play expeditions it is really interesting and challenging!