As it made it past other filtering it is more dangerous. The last possible protection is the user's attention. If the user reads a coherent summary and then opens the message, might they be more primed to treat the message as legitimate?
I agree with you about other filtering being critical and more appropriate. I understand Apple made a good feature. I don't actually know if it will have a negative side effect. I do think it is a good idea to examine the feature critically due to the scale of Apple and the trust its users place in the company to protect them from harm. I also do not think the title of this article is very reasonable bc it insinuates something sinister.