Yes, but as counterargument: there are battle-tested compression formats that offer pretty-damned-good compression. If anything, this shows some questions of calculus when it comes to risk-vs-reward of embracing new standards for compression formats. When was the last time there was a serious vulnerability in major JPEG libs? Or even h.264, which is much newer? Yes, a .webp is like 2/3 the size of a similar JPEG, but for most people are JPEG image sizes a huge cause for concern? Once you're doing lossy compression you're already sacrificing fidelity for filesize so you don't see a lot of machine-crushing-huge JPEGs.