Something that you can create that reflect to your experience and easy to remember and hard to crack
then that's another problem. almost always, these two can not be achieved together.
people aren't known to be able to create strong passwords. to be able to remember their passwords they always end up with weak ones that could be guessed in most cases.
and if the password were strong (truly random) then it can't be memorized over long term. they still have to write it down so that they won't forget it (after like in a year), and if they are writing it down then why not use the method that is already tested and is considered safe meaning BIp-39?
They can be achieved. I already gave you an example. I can also give you another example like !Went>P@r!S-Be$tMem0ryEv_r
Go check
http://rumkin.com/tools/password/passchk.phpYou will see,such password achieve more than 128 bits.
Well, the problem with BIP39 is actually many:
1- losing it
2- confiscating it by government
3- robbed by nagger
4- forgetting where you stored seed phrase
5- not easy to cross board and can be confiscated by airport police officers.
6- extracted by hackers if they get access to your hardware wallet for a few minutes
https://blog.kraken.com/post/3662/kraken-identifies-critical-flaw-in-trezor-hardware-wallets/7- Government seize your hardware wallet and extract your seed phrase. So easy to extract your seed
https://donjon.ledger.com/Unfixable-Key-Extraction-Attack-on-Trezor/I am not referring to Trezor only but also Ledger can have the same issue in the future.
Now, do you understand why seed phrase is extremely dangerous?