> I'm guessing 4G and the like have been able to penetrate areas fairly quickly, but I've not looked at global data on this topic for a very long time. Just ha

> I'm guessing 4G and the like have been able to penetrate areas fairly quickly, but I've not looked at global data on this topic for a very long time. Just having 4G available doesn't mean much if the cells are congested, the networks have poor backhaul capacity, or just in a bad radio environment. There can also be a lot of jitter in latency even if there's decent bandwidth. A bunch of scripts can load fine but then grabbing that one necessary resource hangs and the whole page hangs. There's so many stupid interactivity blockers with big JavaScript pages that are made worse by poor network connectivity. Stuff like infinite scroll or blocking page visibility until an ad is visible breaks in jarring ways. High average speed is nice but cellular connectivity has issues in good conditions and a lot of unpredictability. Huge numbers of web users are on cellular data only (or shit public WiFi). I find too many websites ignore these users with fragile designs because of a preponderance of "works on my machine".