I was wondering the same thing. Without those numbers, everything in this thread is speculation. So, with that in mind, here are the thicknesses of a few different phones mentioned above:
iPhone 7: 7.1mm
iPhone XS: 7.7mm
iPhone XS Max: 7.9mm
iPhone XR: 8.3mm
Samsung S10: 7.8mm
Huawei P20: 7.7mm
With respect to the preceding discussion: yes, iPhones have gotten thicker. Not insignificantly. But aside from the XR, they're not appreciably thicker than the competition.
iPhone XS Max is 7.7mm not 7.9mm

Again not really seeing the point of this thread.