Off the top of my head:
1) Night sight
2) Google Duplex
3) Guaranteed OS and security updates for at least 3 years
4) Unlimited cloud storage at full detail
5) Bloat free pure Android experience (may not appeal to everyone)
6) Industry leading computational photography
7) Integrated call screening
8) Google assistant on tap
9) Access to Project Fi network
10) Google Lens on tap
1) Maybe I don't know much about it and I haven't tested low light modes on my Note 9 yet.
2) Seems like a stupid thing for lazy people. Also only applies if you use Google Assistant.
3) Meh. OS updates are irrelevant. Security updates are good, but still mostly meh - there hasn't been a single recorded case of an unpatched bug being exploited in the wild in the US that I could find. People are mostly using them to figure out how to get root.
4) Sure, great feature if you're 100% covered by networks 100% of the time. I don't need or want to have my pictures be at the mercy of connectivity when there's a local hardware solution to that problem.
5) If it "doesn't appeal to everybody" it clearly doesn't belong on this list. It's absolutely NOT a benefit for a lot of people, me included. In fact, it's actually a negative.
6)If you like the look of Google's post processing, sure. Or are you referring to the way Photos (garbage app, btw) can recognize people, places and things? Because if so, well, my S8 can do this too.
7) Have been able to do this on the unlocked (non-carrier branded) models of the Galaxies since the S7.
8) If you use Assistant. And all the ways of calling up assistant (except squeeze) work on every other Android phone too.
9) Fi is an expensive network for a data-heavy user. Besides, you can use Fi on the Moto G6 and X4 Android One, LG G7 ThinQ and V35 ThinQ as well. Then you can simply put the SIM in any device you want (that supports T-Mobile and Sprint)
10) Again, if you use Assistant. Bixby Vision works on Samsung just as well, IMO.
Except for the low-light mode, almost none of these are innovative, and several of them don't even belong because they aren't even software features.
The note 9 has a lot of negatives
List those then.