I do understand why someone would like ligatures, just not not the whatever it is that is imlemented now:

- if a ligature looks just like a grapheme of another character, why not use that character? why the replacement is done at font level???

- using ligature across morpheme or token boundary is rude typesetting. e.g "selfish" or "c<int>=1;"

Other than that, I do not have anything against ligatures that enhance legibility of text (what they are meant to accomplish)