Stereo, no, unless you get a Home Max. But LOL at getting two of those things for just stereo support.
But you can create arbitrary synced groups. Not the same as stereo but good for multi-room audio.
I decided to go with Philips Hue for lightbulbs since they're the market leader, but the bulbs are individually expensive and need a hub to function. Google is now recommending GE's C-Life hubless smart bulbs (selling them bundled with Home Minis), so you should probably go with them if you don't need other light types (like Hue's light strips) or accessories (like Hue's detachable Wi-Fi dimmer switches, of which I have two.)
I still haven't found a personal use case for smart plugs.
As for the rest of my smart home:
- Chromecasts on all TVs is one of the most important cornerstones for me personally. Home will sometimes display info or follow-up questions on the TV, plus the obvious functionality of casting photos/videos/security cam footage.
- My Roomba is Wi-Fi connected, and in addition to having it on a set schedule, I can also activate and turn it off using the Google Assistant. (There's also a neat IFTTT service that will pause the Roomba when you get a call on your phone.)
- I use a Logitech Harmony Hub to control my TV's on/off state and volume levels by voice. (It's janky as fuck though, but that's all on Logitech's side.)
- I have a Nest Cam IQ indoor camera, and it works flawlessly with Google's products as you'd expect.
- I have Google Wifi for a router. There's hints that more integration with Google Home and their other smart home products is in development, which reaffirms my decision to get one.
- Finally, I have a Weight Gurus Wifi Scale -- I step on it, it beeps twice, I step off, and my weight is automatically posted to Google Fit (without the hellish nightmare that is Bluetooth syncing to a smartphone app each time.)
If I expected to have my own apartment and a stable income in 2019, my next purchases would likely be the Wi-Fi-enabled Roomba mop ("Braava Jet"), Nest thermostat, Nest smoke detector, and the Nest Secure alarm system (already down $100 from its release last year.)
PS- The dumbest but most surprisingly-useful IFTTT service I've found yet merely blinks my Hue lights when my Dominoes order a block away is ready for pickup.