By controversial, I mean controversial. There has been a generalized debate around this feature, which is indicative of a controversial feature. There are proposals for its removal from the standard and some maintainers have rejected its inclusion (glibc rejection of slibc implementation), or criticized it, including the Austin Group. Users seem to also have given a lackluster welcome to it.
I'm not sure what the status on the next draft. But likely there are proposals being prepared or already put forth for its obsolescence, in particular considering its dismaying adoption (it appears only Watcom has a near complete implementation).