Votes and comments aren’t a measure of popularity or importance. They’re super easily skewed by specific communities deciding to hammer the reports or similar - often about things they don’t have technical understanding of.
Other examples would be when Libc++ announced adding bounds checking by default and a huge number of people (from HN and similar) came in to provide votes/+1s or comments with little actual technical feedback
Firefox: 434 upvotes, 61 comments: https://connect.mozilla.org/t5/ideas/idb-p/ideas/status-key/...
Official support software list: https://en.wikipedia.org/wiki/JPEG_XL#Official_support
Comparison/benchmarks: https://cloudinary.com/blog/contemplating-codec-comparisons
Feature comparison: https://jpegxl.info/comparison.png