I really hope that Guardians and Fallen become permanent Allies and that eventually the Cabal too join the Alliance against the Hive and Vex

This is old lore, the reasoning has to do with the pirate like society the Eliksni (now Fallen) developed in the wake of their collapse, the Whirlwind. The Kells of the different Houses maintained control of Ether distribution and used it to control those beneath them. Perform well, you get promoted and get your Ether rations increased so you can grow. Disappoint? Your rations are slashed and you shrink. Fallen also had their lower arms docked when they were demoted to Dreg, hence why they didn’t have lower arms in D1. With the creation of House of Dusk however, docking clamps were removed and Dregs have been allowed to regrow their arms. A large part of the reason why Ether is so scarce is thanks to Guardians specifically targeting Servitors, particular Prime Servitors, as High Priority Targets. We crippled their Ether supply and the Fanatic didn’t help this by actively sacrificing Servitors to create more Dark Ether.

spider is relatively new on the scene so its pointless blaming him. Remember this lore is in reference to their golden age when the traveler helped them. once the traveler abandoned them the ether began to dry up so the fallen fractured into their houses and began fighting over supplies. during this time ether became scarce so the kells in charge would ration it. better performing eliksne got more, failure would result in docking and ether reduction. Spider didnt gain power till after the events of D1 when our guardian killed the kells of the last great houses. rather than reform or crown a new kell most fallen turned to syndicates and left their houses.

Yeah But my Thorn will still kill them at the same rate no matter their size

I am assuming this is why Taniks is so huge, he and others like him such as the Kells of the other Houses were there before the Whirlwind and are at the normal size, meanwhile the rest were born after and don't get enough ether to be at their normal size.

Yes. Thanks. Fallen society regressed after The Whirlwind (their version of The Collapse). So---other than Mithraax and House of Light who hold to what the Eliksni used to be----they now function like a pirate society....or a wolf pack. The strong and the ruthless control things....and everyone else falls in line. Or else. So those at the top became a privileged aristocracy who took what they wanted....then used what was left to control everyone else. [i]"All who are lost are not fallen"[/i] ----Variks.

Probably one of the reasons why Mara ordered a hit on the spider after we deal with savathun Viably also bc he Imprisoned her resurrected brother thingy cause let's face it, Mara is getting the grumps on atm lol All that time in the ascendant realm with no chocolate would do that to a person though