What’s clear is the potential for future abuse mandated by various gov (though that could easily be the same even without all these CSAM measures.. not a new threat). However, the other things are erroneously lumped in with it. It only weakens privacy for iCloud photos if you have CP or photos in a CP database, and it doesn’t prevent E2E with texting… it just gives an additional parental control in addition to the many numerous parental controls (with them kids have no privacy already), and is totally unrelated to the CSAM effort.
I admire the EFF in many ways, but I wish they’d be more exact here given their access to expert knowledge.