Why compress AVIF files?
AVIF already beats JPG, PNG and WebP at the same quality — which is exactly why it tends to get exported at generous settings, on the assumption the format will absorb it. Re-optimizing with PiPic usually finds real headroom without changing how the image looks.
On image-heavy pages those savings compound fast — faster LCP, better Core Web Vitals, less bandwidth for you and your visitors.