Should I prefer iterators over const_iterators?

Question

Someone here recently brought up the article from Scott Meyers that says:

• Prefer iterators over const_iterators (pdf link).

Answer 1

I generally prefer constness, but recently came across a conundrum with const_iterators that has confused my "always use const were possible" philosophy:

MyList::const_iterator find( const MyList & list, int identifier )
{
    // do some stuff to find identifier
    return retConstItor;
}

Since passing in a const list reference required that I only use const iterators, now if I use the find, I cannot do anything with the result but look at it even though all I wanted to do was express that find would not change the list being passed in.

I wonder perhaps, then, if Scott Mayers advice has to do with issues like this where it becomes impossible to escape const-ness. From what I understand, you cannot (reliably) un-const const_iterators with a simple cast because of some internal details. This also (perhaps in conjunction) be the issue.

this is probably relevant: How to remove constness of const_iterator?