I don't see any downsides with Jpegli. Your Linux distro admin exchanges the lib for you, you never need to think about it, only get smaller and more beautiful files. If you use commercial software (Apple, Adobe, mobile phone cameras, Microsoft, ...) hopefully they migrate by themselves.
If they don't, literally nothing happens.
I fail to see a major downside. Perhaps open up your thinking on this?
Yes, Chrome published data.