" http://www.jwz.org/blog/2014/04/the-awful-thing-about-getting-it-right-the-first-time-is-that-nobody-realizes-how-hard-it-was/" (About Ubuntu Bug)
“Design bugs are often subtle and occur by evolution with early assumptions being forgotten as new features or uses are added to systems.”
Source: On Building Systems That Will Fail (1991), p. 78
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Fernando J. Corbató 11
American computer scientist 1926–2019Related quotes

“Each new user of a new system uncovers a new class of bugs.”
Programming Pearls http://www.bowdoin.edu/~ltoma/teaching/cs340/spring05/coursestuff/Bentley_BumperSticker.pdf. CACM. 28 (9). September 1985

Crucible of Creativity (2005)
Context: Putting a new feature into a program is important, but refactoring so new features can be added in the future is equally important. The ability to do things in the future is something that I consider suppleness, like clay your hands that accepts your expression. Programs and documents get brittle very quickly. Wiki imagines a more dynamic environment where we accept change...

Third Party Dreaming on a Winter's Day, Daily Kos http://www.dailykos.com/story/2007/6/8/15484/60943,
“…perhaps this is a "feature", not a bug….”
1995/10
About Microsoft
“"The question is, is that a bug or a feature?" Karl asked.”
The Wizardry Compiled (1989)

"The Free Software Movement and the GNU/Linux Operating System", address at LinuxTag (July 2000)
2000s

“In other words, crew deaths are a feature, not a bug," Cassaway said, dryly.”
Source: Redshirts

[6909@jpl-devvax.JPL.NASA.GOV, 1990]
Usenet postings, 1990