Not really. FLIF is too slow to decode, about 20x slower than WebP lossless. JPEG XL modular mode uses a similar static context modeling with WebP lossless and

Not really. FLIF is too slow to decode, about 20x slower than WebP lossless. JPEG XL modular mode uses a similar static context modeling with WebP lossless and Brotli and likely LZHAM where all the entropy codes are generated at decoding time. Also JPEG XL forces tiled coding, making multi-threaded decoding a possibility.