I believe that in the case of temporary events in Destiny, like Solstice of Heroes, events like the Shattered Throne that only happen for a week every 2 weeks is unfair to players trying to complete their in-game objectives to obtain armor and rewards.
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You can masterwork armor after the event so you can run st with no problem
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During Shadowkeep get to power cap 950 or 960 then use your artifact to achieve Light Level 999 and defeat Dûl Incaru in a one-person fireteam to unlock the true ending of the Dreaming City.
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You can still achieve it after solstice finishes.