This is not about the Max, it’s about the Xʀ but I think you will appreciate my answer and it concerns large phones and their advantages:
I got the Xʀ recently, and while it is significantly larger than my previous 6s, I used to use the 6s with two hands anyway. Yeah, it is a little heavy, but I really like it. I don’t find it unwieldy at all, though that’s not to say that an SE wouldn't be more comfortable, yes, it would, but I would rather have the battery life, and it isn’t an annoyance at all.
As a huge plus, its battery life is astonishing.
Throughout 2017, and up to around April of 2018, I used a 7+ on iOS 10. As the device was broken, I lost patience with it at that time and returned to the 6s on iOS 9 until got the Xʀ.
Ever since getting the 6s, I was impressed by the plus phones’s battery life. I said that my dream phone was a plus on its original iOS version, because I would have great battery life for years on end. I liked to read those huge threads of the 6/6+ and 6s/6s+ battery life to compare, and I was amazed by the results, especially when compared to my already great 6s on iOS 9.
When I got the plus, I said: “This is the phone I want to use for years, and who cares about what Apple launches next, I found my phone”. Unfortunately, the phone had hardware issues, a broken camera, sometimes it freaked out and the screen flickered inside an app, and it had temperature warnings when the temperature was temperate (25 Celsius).
When those things didn’t happen, the phone worked well, and battery life was amazing.
As I said, I went back to the 6s, and although battery life was great on iOS 9, it wasn’t the “it will last all day regardless of how you use it” battery life that I wanted.
The Xʀ fixed that. I love it.