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Why should we assume that?  |
Because they are spending an inordinate amount of time on Lyanna at the same time as they are bringing Jon Snow back to life. The show only has a certain amount of screentime to give, so "most" of it, is given out with a purpose.
It would not really make much sense to show us Tower of Joy, unless what happened to Lyanna and Ned there, affect the show in present day.
Otherwise it would just be fan-service, and the show-runners have already said that they don't do Flashbacks for just anything, because they feel like it is lazy storytelling.
So yeah, that only really leaves us with one option