1) How big are your hands? I have large hands (large size gloves) and the phone is just the right size.
2) I have no issues with Face ID and I never understood why people need to unlock the phone while it is laying flat. If you're using the phone... isn't it mostly in hand? Just pick it up and look at it....
3) You never use your $1,000 phone as a phone. Not sure what to make of this.
4) Switching between apps, do you know about the bar swiping to easily switch the apps? Hopefully you're not doing a bottom swipe up and using the card layout to switch apps?
And finally...
5) It might have been ideal to return the X and get a 8 Plus. All the gripes you're mentioning have been gripes for a lot of people since launch, so its nothing new.
The reality is.. Face ID isn't going away. It will only improve with time. I myself like my iPhone X very much. I have no complaints about it at all. Face ID works great, I never drop any calls (this has nothing to do with the phone anyway, your friend needs to change providers). The size of the phone is the sweet spot (for me). It's not too big and unwieldy like the Plus models and its not small, switching between apps is easy if you use the right gestures, etc.
I really don't get these threads and how they gain so much traction (especially this far after release).
TLDR: Sale it/return it and get a 8 Plus.
Well tbh who uses their phone as a phone these days ? I at most use around 40 minutes per month and when I had an Android device I sent around 1,600 to 1,900 texts per month based off my Verizon app along with 40GB + of data per month.