My phone is a gadget used to look at stuff on the internet occasionally and check emails. I don't do much more with it than that. None of the more advanced features are enabled, I have the OS locked down to prevent it detecting updates and hopefully minimise spyware (e.g. Samsung), and it all works flawlessly like it did out of the box.
Everything works, every day, just like it did yesterday and will tomorrow. I've never had a phone like that before. Battery optimisation and life are very good. Relatively, not in absolute terms. I can't see any reason to change it e.g. were I a budding photographer I'd probably buy an actual camera not a phone and that seems to be the main thing being pushed with the S9.
Were it my Swiss Army Knife of all things Internet Access than I might be able to see a justification for something just a shade quicker but it isn't. That's a desktop PC with two big monitors.
Until we can get to batteries that last for days. screens and keyboards that can project into thin air affordably and a more "finished" operating system (e.g. with rollback and the other things you'd expect are basics of an OS) I think these devices are going to struggle for anything more than tiny incremental updates.