>>106634818
>30 year old boomer jpeg gives it a run for its money in some types of content.
In the OP source mentioned, mozjpeg was used. If compared to libjpeg-turbo then webp achieves like 40% better compression efficiency. You have no idea what you're talking about.
Where Webp does "lose" is when you compare it to 444 JPG as it retains more color information and unsurprisingly can achieve a higher quality ceiling that Webp can't because it's limited to 420.