alt Hacker NewsI think that kind of thinking is similar to the "both sides" stuff in politics. There's a meaningful difference in trustworthiness between different options.
For instance, if you need to track your period, the built in iOS apps are secure, especially if you're using advanced icloud encryption.
The trouble is that it's literally impossible to tell what applications are trustworthy and what applications are not, or whether they'll remain trustworthy over time. So you have to treat them all as untrustworthy. It's a fair rule of thumb because the majority of them can't be trusted.