They didn't remove anything.
End game content is end game content.
TTK is now the end game.
Did you buy TTK?
Obviously not, so you no longer own anything when it comes to end game.
It's that simple.
English
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Year one end game content should no longer be considered end game content (as the game had expanded). For what you say to be true zero missions from year one should be heroic or nightfall missions, otherwise those who don't have TTK should be given the opportunity to play the mission. RNG would assure they only received Year 1 items.
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You bought year 1 end game content and have it. You didn't buy the current year's end game content so you don't have it. What is so hard to grasp?