I hate battery savings modes of any kind. They either mean I get no tactile response, my screen isn't bright enough, weather doesn't update, my resolution drops to cheap phone quality or I don't get emails in a timely fashion. Why would I want to spend a grand on a phone to slow it down and dim the screen? My only complaint about Samsungs is others I've used drop 8 or 9 percent while I'm sleeping and phone should be. Android system just eats the battery and never any way to trace it. I admit I haven't tried the Note 9 yet but I have read others have the same issue. The 15 hour sot claims (hyperbole) strike me as people more interested in setting a record than enjoying the phone. They are running on low brightness low res and doing very little with phone while it's on. If you're gaming or streaming video or even chatting here at full res with everything syncing at 3 bars lte (typical where I am) I doubt you do much better than 5 hours continuous sot.
The tips are great. They DO work no question. I just don't want a dim, slow, unconnected phone. I don't know why anyone would unless involved in a natural disaster of some kind.