I would definitely decline the samba stuff https://www.androidheadlines.com/2017/12/users-report-sony-android-tv-nougat-update-adds-targeted-ads.html
Overall responsiveness seems much better and revised menu layout is more coherent
Android 7.0 update
Got the update on a 2017 TV (USA).
Security patch level went from December ‘17 to January ‘18. Didn’t get a prompt for Samba. Nothing else new as far as I can see.
I faced a similar message on my Sony Android TV but I didn't bother at first. The second time around when I got to it, the message or prompt didn't show up again. Since then it's all good.
https://www.sony.co.uk/electronics/support/articles/00190772
Things I noticed after updating:
Twitch app streams are black. This is resolved by not choosing 'Auto' for streaming quality.
Some sort of crapware called 'samba tv' wants to be installed. I just said 'no'.