You may be conflating two features. 1 - Messages fix. 2 - scanning your entire Photos library and sending hashes to an unaccountable, no oversight nonprofit (NCMEC) to be compared with CSAM hashes - with no way to contest what you send.
1 is arguably a good feature (though it's very intrusive - it has a benefit).
2 is a monstrous invasion of privacy. It has no benefit to you, the user, only a massive potential threat.
Finally, the NCMEC is founded by someone who admitted, if he was judged by the own law he helped pass, he'd be considered a sex offender when he was dating his then-girlfriend.
1 is arguably a good feature (though it's very intrusive - it has a benefit).
2 is a monstrous invasion of privacy. It has no benefit to you, the user, only a massive potential threat.
Finally, the NCMEC is founded by someone who admitted, if he was judged by the own law he helped pass, he'd be considered a sex offender when he was dating his then-girlfriend.