Webp is “current-useless” on account of being unsupported by a lot of software, including Google’s own office suite. Just the same as jxl.

At the end of the day, any standard or protocol that is not widely supported is de-facto useless. Some examples are: ipv4 multicast, TCP multipath, MIR, hashcash; all of this are technically valid, but nothing supports them, so it doesn’t matter