And your post is actually a good example of why I won't buy an X. Please keep in mind these are all based upon MY needs and wants.
Wireless charging - Meh, So I have to buy an wireless charger. But why since my wired charging is already set up in the car and at home. Money saved, estimate $100 (that is an estimate for the wireless mat)
Wireless audio - Has never been a use for me, wired or wireless
Face ID - I would never use, I want my wife to be able to use my iPhone if she has to (Cost unknown)
3D Touch - I will play stupid, I don't even know or care what that is.
Battery life - ???
I actually bought an 8 and had it for ten days, it was $300 less than the X so figured with not using face id, and already not going to do wireless charging even though the 8 has it, thought it worth the gamble.
Returned the 8 after 10 days for 2 reasons:
1. 4 butt dials while carrying in a belt holster. My 6S never butt dialed, ever.
2. Haptic home button. Didn't care for it, in fact found it slightly annoying.
Money saved - Well it was at least $700 saved, and maybe the $1k that the 8 experience convinced me not to spend on an X. And I now hardly ever buy the first iteration of any new product anymore, the butt dial on the 8 is a good example. Getting tired of being the guinea pig for big corporations.
Wow. OK? Butt dials are absolutely a software issue. There are no inherent hardware differences that would make one more susceptible to butt dials.
You don't HAVE to use Face ID. Your wife can just unlock with a PIN. Problem solved.
It seems like you're just not wanting to spend money on a new phone. Which is fine. But the many of the features you mentioned are pretty compelling for lots of people.