the author almost went there with photo from a printed page: ligature could confuse people learning how to program. That's an actual point that matters to some

the author almost went there with photo from a printed page: ligature could confuse people learning how to program. That's an actual point that matters to some people, which I would give a shit about. Instead they presented such mind blowing discoveries as ligatures "contradict Unicode" and "are wrong sometimes". I don't use ligatures in anything other than code, why are those problems?