I find it hard to believe that they are the only quality scripts/programs available out of the thousands listed on sites.
The third answer just explains the reasons behind my asking the question in the first place.
The authors do say "most" rather than "all" other programs are badly written. I mean, most of us here at least try to code carefully. Even if we don't all manage it, at least some of the more experienced monks do, surely?
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"Every program has at least one bug and can be shortened by at least one instruction -- from which, by induction, one can deduce that every program can be reduced to one instruction which doesn't work." -- (Author Unknown)