The planet with their giant super important simulation was being eaten by it (and might still be eating it, we only decoupled it from the sun)
I'm kind of surprised they haven't telaported onto it and tried shutting it down or converting it into something to nullify the sun like in the future that they attempted to make, and you gotta admit it'd make an interesting strike :p
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Bc in the end the almighty was more of a treat to us. So since were involve there's no reason for them to get there hands dirty lol...but really it's bc the vex can't teleport to where ever. They have to have some type of hold over an area. They have limits. Now if a vex portal was on the almighty they would have the ability to travel