The reasons given there aren’t really any good:

  1. For “--” to work, all maintainers would have to faithfully use “--” in
     practically every command invocation. That just doesn’t happen in real
     life,  even after decades  of people trying.  People forget it all the
     time;  no one is that consistent,  especially since code seems to work
     without it. Very few commands require it, after all.

So because other people may or may not forget it, I shouldn’t use it in my scripts/day-to-day usage? That’s about as silly as saying that, because other people will write unreadable code anyway I shouldn’t bother with comments, short functions or sensible variable names.

  2. You can’t do  it anyway,  even if you  were perfectly consistent; many
     programs and commands do not support “--”.  POSIX even explicitly for-
     bids echo from  supporting “--”,  and echo must support “-n”  (and GNU
     coreutils echo supports other options too).

This is a problem, but iff you have to use echo for some reason. printf works nearly equally well and supports -- just fine. I may have read somewhere that using printf is actually advocated nowadays, but I’m not sure where and why.