Yeah, I’m 99.9% sure they’ll never add a stylus, which is a shame. I’ve owned a few Samsung Notes/Ultras and really enjoyed using the S-Pen on a large phone screen.
As for Pro vs. Pro Max, it’s definitely subjective, especially if you’re coming from the SE. For me, after using a Pro Max for 3 years, I didn’t find it immersive , just unnecessarily huge, hard to carry in jeans pockets, and clunky to use one-handed. And I’m not a small guy with tiny hands!
If it had extra features like a better camera, I might’ve overlooked the size, but since everything’s the same, I’m going for ergonomics.