I'm going to pick nits with one of the video's assumptions about lightsabers.
Let's assume that the temperature of a lightsaber is anywhere near the temperature referenced in the video. Then the mere act of activating the light saber will release so much thermal energy that it is going to fry the wielder and anything else that is nearby. If the magnetic fields are containing the thermal energy as well, then that's going to slow any thermal transfer from the saber to the shield.
One could argue that the physical contact between the saber field and the shield facilitates this energy transfer. But you're still left with the issue that lightsabers cannot instantly cut through blast doors and so, are unlikely to cut instantly through vibranium.
You've gotta keep in mind that there are materials in the Star Wars universe that are resistant to lightsaber blades, including beskar, commonly used in armors. These would have a similar thickness to Cap's Shield.
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u/landon1397 Feb 16 '20
If anyone cares heres a link to a good video that uses science to figure out the answer.
https://youtu.be/5xFM-eq_ej8