Hello,

Why don't the Precon decks come with instructions for the mechanics or maybe a small link where you can find it on the internet?
These instructions would be more important than the ones that come with the Precon decks. This only provides background information about the story and general information about Commander mode. But these are the same in every Precon deck.

E.g. here:

https://magic.wizards.com/en/news/feature/magic-the-gathering-fallout-mechanics