@navat604 (Who is one of the community’s electrical experts) makes a very good point, you will generally need to have some kind of switches.
That said, people like smart bulbs for two main reasons:
One) they don’t require any wiring
Two) they can change colors or color temperatures (cool white to warm white)
There are a lot of different switches that can be used with them, including many battery powered options so again, no wiring. Phillips themselves offers two different switches that work with their bridge, but there are many different options. So it’s no longer true that having a smart bulb and you won’t also have a wall switch that controls it. You can have both.
At our house, voice has become the primary means of light control for everyone, both the people who live here full-time and visitors. But we do use some switches as well.
The issue of which is better, smart switches or smart bulbs, is one of the longest standing in this community, and you will find passionate advocates for both positions. But the short answer is that different things work for different people and different use cases. Choice is good. 
If you’d like to read more about switches, the following threads are good: