3D Touch versus Haptic Touch
At this stage it’s somewhat unclear how many of the functions supported by Apple and 3rd party apps on 3D Touch can and/or will be supported on Haptic Touch.

According to Apple, the iPhone XR:


  …doesn’t have 3D Touch, but here again the team came up with something
  really smart. It has a new feature we call haptic touch. So to get to
  the camera from the home screen, we just press on it. You feel a
  haptic tap, and you’re taken right to the camera. This is a similar
  technology to what we do with the track pad in the MacBook Pro that we
  all love so much. It is a great experience.


Source: Phil Schiller, Senior Vice President Worldwide Marketing, 12 September 2018.

What does this actually mean?
The iPhone XR doesn’t have a pressure sensitive screen, but it does simulate the response that 3D Touch offers in that it provides haptic feedback to the user by way of a vibration instead of an actual haptic engine producing that feedback. But the biggest difference for power users of 3D Touch is that at the outset the user won’t get the additional options offered by 3D Touch. 

For example, with 3D Touch a hard press on the Clock app will present the user with the following three options: 


Create Alarm
Resume Stopwatch; and 
Start Timer. 


On the iPhone XR a hard press will launch the Clock app with a slight vibration feedback, but will not provide these additional options. This is akin to having no contextual menu when right-clicking on an item in macOS or Windows, except that with computers the right-click is much loved and used while on the iPhone the usage of 3D Touch has not been so widespread.

All that said, it’s unclear if iOS will try to offer some of these same features via the use of long presses instead of firmer presses in future updates. At present though, if you’re a power user of 3D Touch and don’t want to give it up, you’d be better off purchasing an iPhone XS / XS Max  or one of the older iPhone models.