I don't mind a slow decenter if they are courteous and/or old, disabled, etc.

But a slow-walk-down-the-middle-of-the-steps,-walk-into-the-center-of-the-nearest-door,-and-immediately-stopper is pure evil. The alternative of stopping immediately at the bottom of the stairs because it's not your train is equally blasphemous. Screw you all that do this, especially during rush hour. You all suck and idc what your reason is.