[zebracanevra]

porque no los dos? use <source>

[Mathnerd314]

It's all about convenience for him, Apple's tools generate Jpeg XL so he can't be bothered to resave it for anyone else. He's like "I use Safari and it works fine"

[jshier]

No Apple tools generate JPEG XL by default. You can, of course, export as jxl on newer OSes, since it's built in, but it's not a default. iOS devices still use HEIC as the default "new" image format, but convert to regular JPEG when shared with services which don't support it.

[lmz]

Why would you prefer to have duplicates in different formats when other formats supported by all are available.

[dwaite]

This is a common storage vs bandwidth trade-off.