Open since 2014? No? It was opened in 2014 and closed as fixed in 2014.
edit: plus the blu-ray subtitle encoder itself is new...
And why should they? Most Blu-ray players support the old format (SRT); converting it to PGS gains almost none of the upsides of the newer format (screen placement).
but i do enjoy antialiased blu-ray subtitles of course YMMV :)