This is the same old "if you have nothing to hide, you have nothing to fear" argument and it falls flat for the usual reasons. The first footnote describes a proposed solution to losing privacy from an abusive ex-spouse, and that might work if perfectly implemented, but it's far from the only domestic scenario where privacy is important!

Consider LGBT youths who are closeted and whose parents would not not approve. Consider those with abusive current spouses who feel trapped and need support without their spouse interfering.

No. We still need privacy.