I see that, but it still doesn't fundamentally address what you should do.

1) comply - possibly incriminating yourself, endangering your security and anyone you have contact with

or

2) refuse, get arrested, harassed, deported and probably placed on some kind of watch list as a known troublemaker

Which should you choose?

A big point of the guide is that different people will want to choose differently between these two bad options.

They do explicitly address that - as you yourself quoted above, travelers "... should plan for this dilemma ahead of time", i.e. depending on their personal situation, before the trip they should either be prepared to comply (ensuring beforehand that no incriminating information is accessible and full compliance, if needed, won't endanger themselves or others) or be prepared to refuse and face the consequences; if they believe that they are likely to be inspected for some reasons (the vast majority of travelers are not) then this includes making plans on how to mitigate the effects of not getting across the border.

I'm not sure there's a third choice currently.

Don't travel to the US seems to be the only 3rd option.

Also don't fly through US airspace, don't do stopovers in Canada either (because the larger Canadian airports have US officers).

If you're talking about the preclearance facilities in the Canadian airports, they only inspect people who are departing on flights to the U.S.

If you want to go to America you have to comply. If you are stupid enough to have incriminating information on devices you are carrying across the border then you obviously refuse.

The choice is just whether that privacy is more important than getting into America to you.