Because Microsoft, Apple and Mozilla can still exert pressure: "Support this feature we enabled and benefit from 20% less traffic with users of our browsers" an

Because Microsoft, Apple and Mozilla can still exert pressure: "Support this feature we enabled and benefit from 20% less traffic with users of our browsers" and "Use Edge/Safari/Firefox to browse the web faster (and with metered connections: cheaper)" still has an effect on Chrome's decision making. Chrome had that code, hidden behind a flag. There wasn't any kind of activity. No questions "when will you put it in by default in Chrome?". No other Blink-based browser (Edge, Brave, Vivaldi, Opera) that could easily pick up the support by enabling that damn flag by default did so. Firefox hid JXL support even better than Chrome. No image sharing site that did the math and considered "200KB for a polyfill saves us and our users megabytes in traffic on each visit" and acted on that. That doesn't look like anybody is interested in JXL support. I'm bringing this up again and again because I dislike that notion of "Chrome is the market leader and we're powerless to do anything about it. Bad Google." It neither encourages the Chrome folks to do better nor anybody else to pick up the slack. It's 100% complaint, no matter what Chrome does.