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I totally agree. I may be totally wrong on this point, but it seems to me that over-engineering (in the forms of feature-creep, premature optimization, premature scaling, over-specification, planning for too many unlikely use cases, and all its other myriad forms) is often a tunnel-vision problem, a feature of the blessing/curse of engineers' tendency to focus really hard on a single thing.

If you look at the single-page source code to Plan 9's implementation of the cat command, and then compare it to GNU's, you can almost see it directly. The Plan 9 coders were looking more broadly at the OS and knew they'd need a cat command, while the GNU coders were thinking just about the Unix userspace, so when Plan 9 had cat, they continued hacking by moving to the next thing, but when GNU had it, they continued hacking by stuffing more things into cat.

Hackers love hacking, and this is great for the hackers and the users, but one rarely hears "This program is sufficient. I will consider it complete and write a different one until it becomes clear that the program is insufficient." (I don't exempt myself here.) Or maybe it's just too apparent when the designers forget it, so it stands out.

It's even more apparent on the web, where the default mode of a site is to see itself as a site rather than a component of the web at large.