This is not a conversation about guns. This is a conversation about items that have withstood abuse that are near unbreakable.
Some items I have heard referenced as AK47 of:
Gerber MP600: It’s a multi tool
Old Thinkpad Laptops
Mag lights
Toyota Hilux
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.
Open source might be important if we want to run DOOM on it.
Open source is good because it means it can be maintained even if the manufacturer shuts down. One of the biggest issues with keeping older tech alive and in a useful state is proprietary firmware.