Don't underestimate the forgetfulness of man. it just struck me again with a few passwords to some services. (I was locked out of LastPass during that time).
Try to guess a private key with brute force it's like impossible if I'll take in account a random text with 500+ characters/special ones/spaces...
Of course is not easy and it's like a waste of time (versus create a private key in the classic manner) since I can use other methods but what I think it's interesting it's the chance to hide a private key inside a text.
About the method to create this wallet, all steps could be easily saved everywhere... I was searching also a way to do everything just from "command line" and not using tools or other stuffs online.
BTW thank you all for you inputs and clarifications, much appreciated