I was well aware when I chose to be an early adopter for the 2012 retina MBP and the iPhone 3G, 4 & 6. At that time, I felt it was worth the tradeoff. This time however, I have serious reservations about compromising my entire usage pattern for a value proposition that's frankly not really there. I'm happy with TouchID, full-screen apps, established touch gestures and so forth.
I've also been craving for and ranting about a redesign on the super tired iPhone 6 form factor. I just don't think this is it. Not yet at least. Liking "most of what they've done" doesn't merit a €1300 investment (sans AppleCare) that's only optimised to create animojis.
For me it’s a bit different though, I’m prepared to accept that out of box, it’s going to need work still to make it the device it’s supposed to be. And that many apps are going to need updating, some may never be updated of course. I still have apps that were never updated for the Plus sized phones, or not updated well (hell one of my own apps that I still use has never been updated for the Plus, it’s been discontinued for years, but stilll, never even updated it for myself

) So I’ve always had to compromise on apps that aren’t full screen, nothing new to me.
And I know I’ll get shot for this one, but horror of horrors, I actually prefer touch gestures to a button now. I doubt I’d have said that 10 years ago

but I don’t know, I think I’ve evolved a little with the devices. The touch gestures for navigation just feel natural using these screens, I miss some of them when I switch from my iPad to my iPhone. Still hate touch for anything but basic games though but no phone is likely to ever fix that. Certainly not one with a picture of an apple on the back of it anyway
I am entirely certain though that Apple will in a reasonably short period of time, hold up their end and get the refinements to iOS finalised to better suit the X, they have something to prove (or to some, try and prove) so they won’t rest on their laurels.
I’m prepared to accept the relatively minor shortcomings, because I love the iPhone Plus models far too much to even consider using a regular iPhone 8. Never going to happen. But at the same time, having a screen that’s almost the size of the 8 Plus in the smaller form factor will make things much easier on me.
It’s a situation very specific to me, so I don’t expect my reasons to appeal to anyone else (or at least not many.)
But crucially I do still like the hardware in the X, I wouldn’t get it otherwise, even if it does make life easier. And I know I like iOS 11. So there’s little doubt I’ll like the X.
I love Touch ID but I can see potential for Face ID being more useful in my life. Living in a particularly wet part of Scotland and worse still, enjoying going up into the hills and mountains, believe me I’ve lost count of how many times I’ve cursed Touch ID to hell and back because it’s wet. Or when my hands are grubby as often happens and I’m trying to pay for something in the shop, frantically wiping my hands over whatever clothes I’m wearing, much to the wife’s delight
I’m not, contrary to popular belief, a fool though. It’s not going to be perfect, nothing is, so I am prepared for certain limitations to annoy and even frustrate me, for a while at least, until software is updated. But that I can cope with.