The lack of availability of a certain character is not the only good reason to divorce typeset and handwritten realizations, either. There's also just good typesetting practice. For instance, terminal er in the Abbreviations looks more or less like 'ɛ' with one more hook coming off the bottom, if that makes sense. The closest unicode analog is Ę, CAPITAL LETTER E WITH OGONEK. But it quickly became apparent that Ę looks very awkward at the end of a word. It's a capital letter and the eye has very specific expectations for where capital letters are to be found. So I made the unicode version of terminal er into ę, instead. That's a little awkward to unambiguously write by hand, but it makes perfect sense when reading typewritten text. And of course this relationship of very light digraphia is already very much the norm whenever one compares typeset text and handwritten text.