JPEG is pretty great. There’s a reason it’s the standard basically everywhere. It’s only when you get into the low quality settings (like below 80) or have sharp edges like text (technically any very high frequency data) that artifacting is noticeable. WebP is worse than JPEG at lossy compression in terms of quality.

WebP’s saving grace is that it supports animations and JPEG doesn’t. GIF is absolutely atrocious in terms of quality and compression, so WebP is a huge step up from GIF.

There are, of course, better alternatives to all three, but that doesn’t make WebP bad, just not as good.