I'm gonna be a contrarian and say: .webp aren't really a problem, they are a new and efficient encoding method to put high resolution picture on the internet.

The problem is that very few programs have the ability to open them as of now. Once that's solved, nobody will complain or even notice. Gimp already can and that's more than enough for me.

Heck, I hate this so much, because I can't use them on Photoshop.

But I can open them on Paint and save them as PNG easily.