Isn't it true for all programs? Not just _unix_ programs?
Firefox is portable and it's a large program, but a LOT of effort went into that.
Firefox is portable and it's a large program, but a LOT of effort went into that.
That's irrelevant whataboutism.
TFA is very specifically in response to one pining about older unix ecosystems and seeing them as havens of portability, and explains that that was not the case at all.
Was that in absolute, or relative terms? Since portability between OS/360 and TOPS-10, for example, was non-existent.
Which - of course - varied somewhat different across different models.