Turned out it defaults to Cascadia Mono, my bad. Still your argument is wrong, because, like it doesn't work on your machine, on mine it does.
Nobody said he made a fully functional better terminal, just that the terminal rendering was better and functional. Doing everything needed for a fully functional terminal is a lot of work, but doing everything needed for terminal rendering isn't all that much work.
> The "complaining developer" produced a proof of concept in just two weekends that notably had more features[1] and was more correct than the Windows Terminal!
easily falsifiable bullshit found to be false.
If you were to open refterm once, you'd see a text that explicitly states "DO NOT USE IT AS A TERMNIAL EMULATOR", or something like that (can't open it now to copy exact).