"If the screen is important"? Lol, is there anything more important than the screen? It's literally THE one component of the phone you always interact with. The XR is by no means trash, but crippling it with that resolution is definitely a calculated move by Apple.
I am absolutely certain that for most normal people there are more important features than increasing pixel density beyond 326ppi when so many people are already using 326ppi screens on iphone 8 etc without issue. I’m not sure why that’s a strange or controversial statement? Of course a higher res screen is nice to have but there are plenty of people, arguably the majority, who have other priorities.
If I surveyed all current 6/7/8 users worldwide (all have 326ppi lcd screens) and said they could choose only one feature to upgrade I am certain that the vast majority would choose either longer battery life, faster processor / responsiveness, better camera features or a ‘larger screen’ which would all improve day to day usability, before they requested a higher pixel density.
It most certainly is a calculated move by apple - to prioritise the features most likely to persuade normal consumers to upgrade and compromise in the areas less likely to deter upgrades. I am confident the XR is going to be a phenomenal seller for Apple.
I use my phone constantly through the day for streaming music, browsing mostly text based websites and articles, facebook, youtube (mostly news etc nothing particularly hi-res) apple pay contactless payments, navigation on long distance bicycle rides and hiking, using maps/guides for travel worldwide etc. I use zoomed mode on my 6 plus as I prefer larger buttons and keyboard for one handed use over more real estate but smaller UI.
I don’t use my phone to watch netflix/films etc, I very rarely take photos other than when on holiday in which case it is mostly selfies (not really bothered about optical zoom I just like to point and click) and I prefer to view/edit/organise photos on a larger ipad/mac anyway.
The XR offers the best battery life of any iphone - great for travel or all day use, fastest processor ever in a smartphone, same camera as XS (aside from optical zoom), improved face ID. These are all features that will have more of an impact on normal consumers day to day use than a higher ppi, and the vast majority of normal consumers will not consider it worth paying 350 (to upgrade to the max) for the screen upgrade and optical zoom both of which will have minimal real world impact on day to day use.