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  • $\begingroup$ "It does not seem to me that there is anything wrong with Join. " As said by Shredderroy in the comment above, "The fact that many of the built-in functions treat expressions of the form Head[arg1, arg2...] uniformly regardless of the actual head, can be a blessing and a curse. " The change for Join is understandable, but it also undoubtedly make code more error-prone. $\endgroup$ Commented Oct 26, 2018 at 14:05