Checked caniuse which led me to resources on bugtracker. Both have closed the tickets with wontfix. Firefox is focusing on AV1, and not budging on this until the patent situation is no longer a barrier. Chrome's reasoning feels like it relies on old data (these tickets are 5-6 years old), additionally citing firefox will not support it, with further reference to similar performance in other codecs (VP9). Because of the patent, there's zero interest in it's adoption, no matter the cost of implementation