You're not wrong of course - this would come with heavy UX issues though. E.g. it's hard to type 10 words into a password field without messing up. And _really_ hard on a mobile device.

1P would allow you to have a password like "1234" and still have the same key entropy as that 10 word password alone.

Depending on dictionary size, the entropy is way lower. Assuming a dictionary of 10k words, it’s only 53 bits. In the comic it says 44 bits btw.