Ecosystem being slow to adopt it is something that can be fixed or improved, but also more importantly (given jpegxl & avif comparisons) are things that will impact any new image format.
Meanwhile annoyances of the codec tend to be things that are dramatically harder to deal with. Like HEIC being a license minefield and also slow as shit. Or that many of these newer image codecs do not have ways to work with them in a memory efficient manner like jpeg does (see eg libjpeg-turbo's sample size & skip scanline options). Or WebP insisted on being in a RIFF container for... uh... absolutely no fucking reason whatsoever afaict. Fortunately RIFF is so trivial that this overhead doesn't actually matter in practice, but then HEIC & AVIF dials up the annoying container bullshit to 11 thanks to their video heritage with ISOBMFF
How much slower? I'm finding very conflicting numbers.
But on the timescale of "wow this still doesn't support webp" those patents will solve themselves soon.
Though TBH I still use JPEG, PNG, or GIF, depending on use case, out of habit. The size saving for the same quality of lossy compression is not something I've found myself hankering for. It is different if you run a site that sends out millions of every image, but nothing I do is that popular and is never likely to be, and no one stuck on a really slow connection where the difference would matter to them is going to be accessing my stuff.
That is true in life.
EVs aren’t annoying, the charging infrastructure is.
Etc
That’s the whole point, though. If the tools I use don’t handle it properly, it’s annoying. Saying it’s an ecosystem problem doesn’t change that.
How long has it been now? And from what I’ve seen, even Google’s own stuff doesn’t always handle it. That’s not helping their case.