Played since 2017, I made a forums account just to bump this issue
This was going to be my fanfest question for YoshiP. I was even sitting in the front row to ask it, but sadly there was no time at the end of the live letter.
"Due to the stronger gear available as new content is released, The endsinger can currently be brought to 1-5%hp in the duty finder before the final phase even begins, often dying within the first 10 seconds of the final crescendo, instead of the 3 minutes the phase took during 6.0.
Many first time players are missing all the prayers of the scions, and the epic finale of the first 10 years of final fantasy 14.
Is it possible that endsinger be synced to the same ilvl as the level 90 artifact gear, so that players clearing the content for the first time today with friends can experience the content as it was intended on release?"
It is an absolute tragedy that players completing the fight after 6.2 via duty finder are robbed of the story's final climax. This must be an oversight. I really hope the dev team can look at this and fix it. It's not the same with trusts and is benefitting essentially nobody by the instance being 3 minutes shorter. Even as a player who runs trials roulette daily, I would want to experience this moment again, especially with how long the instance is already.