Ditto with HEVC and HEIF. With the even higher royalty fees of HEVC and HEIF, availability of alternative royalty free formats backed by Apple's competitors, Apple will be walling itself off once again.
In the case of HEIF, MacOS/iOS will automatically transcode to JPEG anytime you share a HEIF image - it's solely being used to save storage space on your personal device, so in reality almost no one will even notice the change, save for the upside of having more free disk space. H.265/HEVC is pretty trivial to transcode to H.264 or whatever else you want, but given how wide support is spreading I doubt people will often have to do this.
Metal on the other hand is an entirely Apple in-house technology.
(1) WebM/VP9 is only royalty free because MPEG-LA et al have not asserted any patent claims against it. Given that VP8 was granted a license in the past means that it is almost certain to be infringing. The fact that Google doesn't indemnify their users should tell you something.
(2) H.265 is supported by over 100+ more companies than VP9 and is already in shipping hardware from Sony, LG, Samsung, Intel, AMD, ARM, Nvidia etc. It is the standard for TVs and other hardware devices, standard for terrestrial broadcast and will soon be the standard for internet as well.
Web browsers might supported HEIF largely because Imgur and other image hosting will benefits from smaller size.
Wait, no...