Should we all switch our passwords to three random words?

I also found that article by Paul about how hackable 3 word passwords are, and now found this discussion. If my iPhone ever got remote rooted through hacking or stolen (and shut off so I can't use Find My iPhone to wipe the device) and they use a GrayKey tool or other device to physically get into my iPhone, would the Secret Key be bypassed?

So then my only layer of protection would be my three word password?

I'd like to continue using a 3 word password because it's easier to remember and quicker to type out than a 6 word, so I'm curious if the Secret Key could be bypassed in these cases and the only protection is my 3 word password.

https://paul.reviews/passwords-why-using-3-random-words-is-a-really-bad-idea/
https://appleinsider.com/articles/21/06/22/iphone-hacking-tool-graykey-techniques-outlined-in-leaked-instructions