Maybe knowing where a language is going will help them implement older features? Also, some things are technically easy once all the conceptual wrinkles are ironed out. There is no reason some of these can't be added before C++20 is 100% supported.
I can't imagine why someone would care about that, rather than about the specific changes they actually use or want to use.
I can't imagine why someone would care about that, rather than about the specific changes they actually use or want to use.