No. A cargo cult is about doing X, or more commonly some flawed facsimile of X, in order to attain some desirable Y, because you've seen someone else do X and i

No. A cargo cult is about doing X, or more commonly some flawed facsimile of X, in order to attain some desirable Y, because you've seen someone else do X and indeed attaining Y. What you don't know, however, that Y is not directly caused by X but there exists some W that's the cause of both X and Y. Now, "Y after X thus Y caused by X" (see: post hoc ergo propter hoc) is a perfectly fine hypothesis worth testing, but to keep doing that even if it doesn't work? That's the "cult" part. What Feynman criticized were certain fields of study, which in his opinion claimed to apply the scientific method to get scientific results (and importantly the associated prestige of Doing Science), but which in his view only practiced a facsimile of the scientific method and got merely facsimiles of scientific results! Now, cargo cult engineering definitely also exists. If you do X – even without entirely understanding why – and reliably get the wanted result Y, that's engineering. If you don't get exactly Y but are able to adjust X to compensate, that's also engineering. But if you keep doing X without understanding why and keep not getting the wanted result Y (even though you might get some different result Z and misinterpret it as Y), that's cargo cult engineering!