APL programmers usually use an APL keyboard layers. Some people use Compose. Vim offers digraphs. Some editors can replace with a macro. Input is a solved issue, but the outputs can often either be more clear for reading either for lack of ambiguity such as the ligatures or in information density as seen especially in the APLs (see a 1975 demo) (hence Chinese writing taking up less paper space being more information dense). The ligatures themselves are still taking up the same physical character space since that is how ligatures operate. I believe the goal here is to achieve something similar with ligatures, except taking an opentype hack instead. If you believe ligatures are more readable, then everyone should be seeing these concocted symbols on any device or font, which Unicode offers without the hacks or ambiguity.