ok, but how often do you let your phone unattended for more than a few minutes ? (also according to the Fixme conference, this will change soon - Your Phone & You - Sailfish OS and Privacy - Invidious)
Something being bad at a given time does not mean it will never be secure and you should behave negatively towards it.
Maybe your friend that won’t use SFOS because he does not trust installing his bank app on the phone could try the OS first. (I doubt his bank app is ported to sailfish anyways) It’s not about behaving binary and going full sailfish when leaving the iOS/Android phone.