[pseudoramble]

I get your point, and they do address this later on in the piece kind of. It sounds like it's perfectly valid to say no, especially after reviewing the document and their architectural meeting where they discuss it more in depth. But they're also not trying to actively encourage saying no in the document, instead encouraging responses that points to how to get to a solid idea.

So saying "no" isn't forbidden, but it isn't the default either. At least that's my interpretation.

[dilyevsky]

Some people choose to not say “no” and we encourage that, okay?