I'm French.
Trying to tell it to "turn downstairs amplifiers off" almost always results in a search for something ending in "fire", or something. It simply never learns, no matter how many times, on a daily basis. As far as I can tell, Google assistant doesn't seem to realize that it made a mistake,
1. Instead of "turn downstairs amplifiers off"..... I'd say: "AMP (or amps) OFF". With Alexa you can setup routines to operate dependent from where YOU are when you speak. BTW.... I am pretty sure Alexa also speaks French.
2. Google is smarter than Alexa... but Alexa learns voices. Alexa even understood the tiny grandkids (they LOVED that).
I have multiple sets of amps, and I don't want to turn them all on at the same time due to power consumption. That's why I use this long command.
There is one Kasa HS100 smartplug downstairs powering 3 amps. Another HS100 upstairs powering 3 more amps. Altogether these power 32 speakers in ceilings/walls.
The amps are receivers using 5.1 and 7.1 analog inputs, with Chromecast audios. Each 5.1 receiver can handle 2 Chromecasts. Each 7.1 can handle 3.
My entire use case for home automation is to save power, so it's crucial to me not to turn on amps that aren't needed. If I could, I would create ways to turn on only the one amp for a specific room. But it gets very complicated to figure out which one that is, since the mapping isn't 1 to 1. And I would need more smartplugs.
Hell, ideally, there would be some kind of beacon detecting which room I am on, and when I want to turn audio in, it would figure out which room I am in, and turn on the right amp, without needing to tell the software which room I'm in. One can dream...
Same thing for the circulation pump, there should be a motion sensor to turn on the circulation pump only when I'm about to take a shower.
The other thing is that I'd like some auto-off timer for all these devices, in case I forget to turn them off. The Belkin Wemo I had before had this feature built in to the firmware. The Kasa do not, unfortunately. The Belkin kept dropping off the network randomly, though, so I replaced them with Kasa, and those have been reliable.