Hi all. I have one question (well two actually) that I think I know the answer to but want to be 100% on and cannot find a precise answer to. If I keep secure only my BIP 39 seed pass phrase is this all I will ever need to recover my private keys? Do I need to keep additional information as well? I have heard you should keep such things as the wallet you generated the keys on, the date you generated the seed etc. Is this really necessary? Is there a chance in future the bitcoin standard could evolve away from the 24-word BIP39 standard and my seed phrase could become inoperable to regenerate my private keys?

My second question is what coins are not covered by the BIP39 pass phrase? I heard etherum isn't but uses another standard. Any others? Do most coins do so? Thanks in advance!