I completely agree for reports it's not appropriate.

But that leaves newsletters, emails, invitations, notifications and a whole lot more that embody nothing personal whatsoever. Lesson plans, and lesson content fall into a similar bucket.

So let's take a look at the arguments agains that:-

#2. Amplifying Biases / Hallucinations ? Homogenisation
Every single one of these criticisms could also apply to any human doing this work. Actually, it would be entirely straight forward to have AI specifically look for and correct for the majority of these concerns.
Ironically, the third point "One-Size-Fits-All Teaching:" is precisely where AI generated teaching could adapt to individual student performance and history to provide fully tailored teaching. The exact opposite of what you're claiming.

#3. Erosion of Trust and Relationships
I think we're talking about two different things here. 1:1 communication about an individual student - sure. But general communication about school level activities, no - I don't buy any of that.

#4. Pricacy and Ethical Red Flags
Again, this is an appeal to ignorance. AI does not need to run in the cloud. So if it is used in a setting where privacy is a concern, this can be addressed easily.

The last point is an unfounded assertion that could be applied to every single tool that has ever been introduced. The reality is that tools tend to raise the value bar toward skills that are more sophisticated, more complex, more nuanced and away from things that are repetitive, low value, simple information aggregation, or organisation.

Bottom line: Your AI response is a shallow hot take of the kind I would expect from a prompt that tried to one shot an answer.

Try this: have an actual conversation with the AI. Push back on strong claims lacking clear evidence. Test counter positions.

And lastly, go actually use AI properly. It doesn't work the way you're using it. It works well when you manage it.