I’d suggest that language fluency and cultural awareness are probably important for your son to be able to settle in and socialize. Cities in Europe (especially Northern Europe) are likely to be best if he speaks English but no other European language?
I’ve used the “writing tools” extensively for minor changes, like changes to capitalization on a large block of text. It makes the phone a little less of a consumption-only device.
I’ve also found the image editing tools handy from time to time, and the automatic calls to ChatGPT on the more complex natural-language questions can sometimes be handy, even if you need to wait a while for the response.
The notification summaries are sometimes very handy and sometimes absurdly incorrect and misleading.
I’m really looking forward to Siri being less frustratingly stupid, but we’ve got a while to wait for that, and we probably shouldn’t set our expectations too high. I do respect that they’ve not shipped it rather than shipping something broken, though.