So as an example - I don't have any voice control in my house, would hate to have it, but then all my lightbulbs are app controlled - just means I don't have to do the usual "tour around the house" in the evening switching every single light off, I get in bed, then on my phone click one button and everything switches off. It's very convenient.
Yea, that’s convenient too. Having the lights controllable is the prerequisite. Your preference for tapping an app vs mine for using my voice are both possible.
Both android and iPhone have voice control so if you have a smart phone you have capability for voice control, you just don’t use it.
For example, when I come downstairs and say “computer lights on” it’s easier than flipping two switches and turning on two lamps.