Mesh can certainly be viable in situations where it is simply not possible or practical to install ethernet to support traditional access points.
You could be in an apartment or rental housing where you can't readily install the necessary cabling because you don't own the property, are in a historic home where you can't or don't want to risk damage to finished surfaces, or simply don't want the interruptions to the aesthetics. Or you might be in a home where there aren't accessible wall or ceiling cavities to run cabling.
Then there is always the balance between affordability and portability.
That being said, distributed WiFi via traditional ceiling-mounted access points are generally better than integrated table-top mesh units, both from a performance and stability stand point.
Stand-alone, non-mesh routers. . . probably about profitability. Low cost routers for the folks that can't afford, or don't need more advanced devices.