So my point being, if Adamantium doesn't even really exist in the current MCU, they're just going to have it magically appear now becausee of the
"Snap" and "x-genes"?
Adamantium is an alloy and is NOT an element, so it doesn't have "to appear". It does not naturally occur in nature. It can be invented, as it was invented in Marvel comics.
Vibranium on the other hand is a naturally occuring element. So vibranium rightly "appeared" whereas adamantium did not in comics and should not in the MCU.
In the current MCU, Vibranium is the strongest metal and not even considered from earth. Adamantium is supposedly stronger. A multiverse would make that make more sense imo
Vibranium's characteristical perceived strength in the comics is not primarily about toughness of the material.
The resistance of vibranium to damage in the comics is due to its ability to absorb large amounts of kinetic energy.
In the MCU they mix it up, and they mix it up inconsistently. Sometimes the shield absorbs kinetic energy (when Thor struck the shield in Avengers 1) sometimes it does not (when a Chitauri bomb exploded in an office, throwing cap out of the window and on to a car).
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Cap's shield in the comics is made of adamantium
and vibranium.
Thanos showed that his weapon in endgame was at least as strong as MCU vibranium.
I am not sure how they will clean that up, if at all.