Not sure if this is responding to the right comment but gotta try to find out! I did a couple of tests re DPI on a staging customer’s website and it turns out I ought to eat my own words. I remember that we did run into some problems in the rollout amok but that must have been due to orientation more than DPI. We took out DPI scaling rules, adjusted px-based queries and added orientation and it all seems to work as expected across the devices we test against.
All in all thanks for the article again and the conversation that allowed us to streamline our queries.