Bikeshedding, we can also start discussing why `println` doesn't print anything on the printer, apple doesn't sell any fruits and their ipad is not really targeted to women during period, microsoft has no double glazed windows offers, oracle without cloud based prophecy api and why ml lang and machine learning are stealing established, widely deployed in most kitchens millilitres measure - nobody gives a crap.
println does indeed print if you're using a teletype. The fact that you're probably not using a teletype is simply a matter of preference on your part.
Teletype current loop ports were common on machines up to the 1970s, but by the 1980s had largely disappeared. The serial port card on the original IBM PC and the XT had 20mA current loop support, but it was very rarely used, so AT machines onward removed it. (MIDI is also a current loop, but MIDI uses 5mA rather than 20mA, plus the protocol is different.)
You should be able to connect a teletype to a modern computer by using two conversion devices, one USB-to-RS232 and the other RS232-to-20mA-current-loop. Then the teletype will appear to the computer as a (very dumb) serial terminal.
