WebP still seems far behind on (1) to me so I don't care about the rest. I hope it gets there, though, because folks like this seem pretty enthusiastic about (2).
> webp has a lib on Linux but somehow, standard image viewers just do not read it
That may apply to old "LTS" Linuxes, but not any relatively recent one. Xviewer and gimp immediately come to mind as supporting it and i haven't had a graphics viewer on Linux _not_ be able to view webp in at least 3 or 4 years.
(1) compatibility
(2) features
WebP still seems far behind on (1) to me so I don't care about the rest. I hope it gets there, though, because folks like this seem pretty enthusiastic about (2).