I think what bugs me about it is it is revealed way too early in most of these. SKT seems least guilty. But even that has 5th level characters knowing they are dealing with earthshaking events.
I said with HotDQ that it should have excluded the whole 1st level party encountering an Adult Blue Dragon and spent at least a few levels of the PCs dealing with brigands and kobalds and the local problems they cause. Get the PCs to develop a stake in the setting...only in the last couple episodes of HotDQ should there be some foreshadowing of RoT and an ascending Cult of the Dragon.
ToA should just start with the party in Chult for reasons completely unrelated to the Death Plague. Exploring ruins, ejecting colonial powers, protecting resources...let the PCs get familiar with Chult and its dangers and people. Around 5th level start to introduce the death plague and even rumors of powerful NPCs taking an interest in the area (and dying or disappearing). Then have the PCs gwt apporached to look into it. That way the "why us?" question has a logical answer: "you're here already. Others have failed and we have no time to find someone else."
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