My impression was that codepoints for ligatures are there for backwards compatibility reasons. In that case they wouldn’t add codepoints for brand new ligatures. So I don’t really get the point that he’s making (if I’m correct).
Yeah, most of the codepoints for ligatures that exist in Unicode are for compatibly mapping from old encodings that predate modern font ligature support (such as EBCDIC had a bunch of manual ligature encodings). These days Unicode suggests leaving ligatures entirely to fonts and unencoded as most people don't need to round-trip through an EBCDIC speaking mainframe (hopefully!).
