I am looking forward to the day that everybody will switch to WebP without fallback. The reason for not changing to WebP-only is Safari, both on desktop and mobile, as you can see in caniuse. In my last post on WebP, from October ‘22, I reported a 5% usage of Safari 16 (desktop). That number has grown to 60%. That is not yet the 90% I said that was required to convince everybody to change to WebP-only.