Well those issues occur with other makers too. My Echo devices only control specific home devices, and not that well at the moment. I suspect the same is true with Google Home. The makers seem to make alliances with home device companies, but none make alliances with all of them. I do notice that Apple incorporated home device scenes into their system, just as Amazon did. I'm not sure about Google Home, but they likely have them too. So it makes me wonder if they are all using a standardized control system for home devices. A standardized system would be nice, then home device manufacturers could more easily get their devices to work across the various devices. But I haven't researched to see if that is the case. I know that my TP-Link lightbulbs have scene capability, and the scenes work very well with my Kasa app on my iPhone and iPad. Kasa is TP-Link's own app. But Amazon has issues with scenes on my TP-Link lightbulbs. So each company with home assistant devices has to get their firmware working correctly before 3rd party home devices will fully function.

Personally, I find it is easier, and often quicker, to use apps on my iPhone or iPad to control home devices like lightbulbs. Having to remember the magic words to say to a home assistant is a PITA, especially when they don't always work. If I had a house full of remote controlled lightbulbs, music system, thermostat, etc., then I think a master control app on a tablet or phone would be much better for controlling those than trying to remember the names and commands for each device. But that is just me...