> and why there is a cable to pull, but that's a different thing
Huh... How is it set up where you live? I've ridden buses in Europe and I remember them having cables, or at least buttons.
It's different per country, and even per city within the country. As a rule of thumb, big cities don't have buttons/cords, smaller ones do.
I've never seen the pull-cord things in Europe, but they seem to be common in the US.
To European eyes they seem old fashioned, untidy, and possibly dirty.
It's usually buttons in Europe. The cord things always make me think of train emergency stop cords (though these days those are usually "break glass" buttons).