Should MSE create canonical posts for common "non-trivial" errors (as in not arithmetic or typographical-esque errors)? One example is freshman's dream, which is an erroneously calculation of $(a + b)^n = a^n + b^n$ which keeps cropping up leaving many duplicate answers. For these types of errors, should we create a canonical or just leave them be?
The way I see it, this creates some clutter and a canonical would allow for close voters to easily mark it as a duplicate and prevent duplicate answers. But I'm not sure if it's worth the hassle.