And then you can go one step further: for anything which echo cannot do by itself, you can create a virtual switch in SmartThings, And then when echo turns on that virtual switch (either directly or with an echo routine), you can have smartthings respond to that switch coming on. So that’s how you could add a whole bunch of activities to your good night routine.
So you can end up with one single voice statement to Alexa, like “Alexa, bedtime” and use an echo routine to have several hue scenes start and several other things happen in SmartThings.