Every time I see this I'm hoping that it has taken off, because it feels like such an obvious improvement. Instead of that we have some support for it in FreeBSD, and a homegrown solution in some packages like util-linux. Yeah, there are some concerns, but the concept seems sound and the implementation can be iterated upon.
For instance, years later and it still isn't packaged in Debian. If nothing out of the tens of thousands of Debian packages has a dependency on it there presumably must be a good reason.
It strikes me as one of those libtermkey¹/libvterm things where Leonerd pushed it for years before anybody really used it, despite it being a seemingly obvious improvement over the status quo.