It has a display and even bluetooth. The Firmware is open source. The schematics are available.
Imo open source is not that important for an iron unless you want to add a klingon translation. But the iron is pretty good, although it is often rather >50 bucks including shipping.
Sure there is this one guy who changes the oled to a different one bacause his screen broke and the old one has been difficult to source. Most people won’t fix a 30$ iron. Especially since you need an iron to fix it…