The point, i believe, is that it's okay to think "i know that this code has quadratic complexity, and that is acceptable right now".
You might agree with that even though you consider that it's not okay to think "i don't know what the complexity of this code is" or "i don't know what complexity is".
It might even be okay to think "i don't know what the complexity of this code is, and that is acceptable right now". You should be able to imagine some cases where that would be true.
https://twitter.com/evolvable/status/1113031660637847552
The point, i believe, is that it's okay to think "i know that this code has quadratic complexity, and that is acceptable right now".
You might agree with that even though you consider that it's not okay to think "i don't know what the complexity of this code is" or "i don't know what complexity is".
It might even be okay to think "i don't know what the complexity of this code is, and that is acceptable right now". You should be able to imagine some cases where that would be true.