He didn't really big up the 4000 MA battery that much which I think for some users will be a big deal, from 3300 to 4000 is a good leap in my view.
I'm still on the fence on this one, I like my Note 8 but I did purchase through the Samsung upgrade program so I will have the option, but sadly have to return the Note 8 if I went ahead.
Reasons for me to upgrade so far would be ....
Better battery
Better camera (albeit not a great deal)
Faster chip
Dual speakers
Latest flagship.
Regarding the 4000mah battery, if the spen has its own battery then that will eat up some of that 4000mah in order to charge up that battery while it's in the phone. It won't be like you had a 4000mah in an s9 plus without that spen.
I see the upgrade from the s8 plus to the s9 plus or Note 8 a big upgrade due to the dual camera and most important the 6gb ram.
You also get stereo speakers with Note 9. Now if the Note 9 didn't have stereo speakers then I'd be saying upgrading might be a waste of money then simply for a blue tooth spen and slightly newer processor.
The BT spen sounds like a big gimmick to me.
I thought the Tab s4 has the finger print built into the screen? Odd they put it on there but note the s9 plus or the Note 9 coming out at the same time.
I have a hunch that maybe they're not 100 percent sure how well it will really work so they figure to put it on the tab s4. That way if it has issues at least it doesn't mess up the Note 9, one of their flagships which would be a big mess.
You might recall the Note 4 and S5 how it was the first samsung's to have the finger print sensor and that thing was a big pain to use. I ended up just using pin code to log in. I know if the first year of under the screen sensor was a pain and the arse to use I'd be really mad after spending nearly a grand on the Note 9 and not being able to use finger print to unlock.