All browsers support AVIF and JPEG XL now. I was hoping to keep their download size benefits.

Firefox added support only 3 days ago! And this doesn't cover the ESR version.

Sure but this is a technical post aimed at a technical audience.

	▲	bigstrat2003 15 minutes ago \| parent [-]
		None of which means you should expect your audience to have a new version which came out three days ago. Lots of technical people stay behind the bleeding edge for very good reason.