It’s a shame that eBay is focusing their PWA for Android devices first now that iOS also support Service Workers. I’m sure it’s because there’s some additional functionality that isn’t supported and
I have reached out to the author for further clarification within 9 minutes of me reaching out I had an answer from Alex Russell. It turns out that Safari are still yet to implement some service worker features including Navigation Preload which are required for this work. Thanks Alex!
It doesn’t matter if you’re in a train going through tunnels or you’re in a developing country, Internet connectivity and web access can be a barrier. At eBay, we don’t want these barriers to stop you from accessing our marketplace. Today, we are exploring new ways to make it easier for you, as buyers, to access our global marketplace if your Internet connectivity goes out in the middle of shopping with an offline experience.An excerpt from Exploring Progressive Web Apps to Enhance eBay’s Mobile Experience