pip3 : command not found

[Jon Ribbens]

On 2016-10-31, Ben Finney <ben+python at benfinney.id.au> wrote:
> Instead, you should invoke the exact Python interpreter you want – and,
> by extension, the Python environment into which you want packages
> installed.
>
>     $ /foo/bar/virtualenv/bin/python3 -m pip install LoremIpsum

I'm slightly curious about that. /foo/bar/virtualenv/bin/python3
will just be a symbolic link to /usr/bin/python3, so how does
invoking the intepreter that way make any difference?