Worst ideas/features in programming languages?

[SealabJaster]

On Wednesday, 20 October 2021 at 09:32:15 UTC, IGotD- wrote:
> Why are many using D using printf to begin with and not the D 
> equivalent like writeln?

In the case of the string interpolation DIP, from what I remember 
it was mostly Walter was very adamant on string interpolation 
being printf compatible.

In the general case, I assume people using `printf` are mostly 
GC-phobic, or are just in general writing @nogc code.

Here's the DIP, including the links to the discussion threads: 
https://github.com/dlang/DIPs/blob/master/DIPs/rejected/DIP1027.md

I can't be bothered myself to skim through things to pick out 
examples, but feel free to do so yourself.