> In code, comments are our signposts

No. Naming and good architecture are. Intuitive folder trees. Concise docs. Clear separation of concerns such that naming can suffice.

The more comments you need to ‘map’ your code, the worse of a job you’ve done.

    char*M,A,Z,E=40,J[40],T[40];main(C){for(*J=A=scanf(M="%d",&C);
    --            E;             J[              E]             =T
    [E   ]=  E)   printf("._");  for(;(A-=Z=!Z)  ||  (printf("\n|"
    )    ,   A    =              39              ,C             --
    )    ;   Z    ||    printf   (M   ))M[Z]=Z[A-(E   =A[J-Z])&&!C
    &    A   ==             T[                                  A]
    |6<<27<rand()||!C&!Z?J[T[E]=T[A]]=E,J[T[A]=A-Z]=A,"_.":" |"];}

Disagree. Personally that sounds like a massive barrier to reading the comment to me. Limited width column text is generally regarded as easier to read, make your comments easier to read. Especially as I probably have the code open in a limited width window, as that's what I expect from code.