Two very different kinds of "nothing is changing." One means every flow and reaction has stopped. The other means a process is running flat-out — and just happens to look identical on a chart.
Watch a temperature or concentration readout hold a flat line for an hour and it's tempting to call the system "at equilibrium." Sometimes that's right. Often it isn't. A continuously stirred tank reactor running full-tilt, with reactant pouring in and product pouring out every second, can produce exactly the same flat-line readout as a sealed flask that reached true chemical equilibrium years ago. The instruments can't tell the difference. The physics underneath is nothing alike.