Browser engineers have an extremely difficult job. The codebase is incredibly complex (they aren't just copying data from one system to another - it takes years to get up to speed in just a small area of the codebase) - any change (even improvements/fixes) risks breaking websites.
You might think you are complaining to a faceless organization, but in reality your really just talking to 1-2 people. Be kind. Each time an engineers gets dumped on you risk them throwing in the towel for good (engineer burnout is real), your bug will very much not be fixed then.
Engineers like fs@ are one of a kind and experts in their area. (fs@ implemented SVG favicons to Chromium for example - https://bugs.chromium.org/p/chromium/issues/detail?id=294179 ). As the web platform is so expansive there are really only a few people in the world at one time who understand various problems deeply enough to make progress on a fix.
What does help? In this particular case - if you are affected by this bug starring it helps. If you can kindly describe how this affects you - that also helps. The Chromium project actively tracks highly starred bugs. (Keep in mind the project also takes into account "gaming" the count so getting 100 people to star the bug mindlessly wont help).