On the other hand, it's absolutely crap at doing complex automations. The Web UI gives me heartburn any time I need to make it do anything else than simple "if temperature is over 40 on this, do this" things.
The UI does make complex automations _possible_ for non-programmers. But for me, every time I click on the UI or attempt to "program" using the convoluted YAML syntax I keep thinking "this would've been like 5 lines in an actual language...".
Thus: I use Node RED for the more complex stuff paired with an external program I made that connects to the HA Mosquitto server and pokes stuff directly when needed.