RE: "As for changes to expect in 2019, Kuo says the
iPhone XR successor may be upgraded to 4GB of RAM,"
That's a definite !
If they don't, it's a MAJOR class action lawsuit that will cost AAPL hundreds of Billions of dollars in market cap !
Furthermore, I believe there is a very good chance that AAPL offers ALL existing XR owners, as well as those who purchase before Sept 2019, a low-cost Trade-in upgrade to the 4 GB model in Sept.
The existing XR is in-deed broken ... Photosets has proven it !
The existing XR is the first "Lemon" that I am aware of that AAPL has ever produced.