Yes, we do need.
Broadband connections are more reliable and faster. Also, comparing the prices, the wired connections are cheaper. In Broadband connections, you may get unlimited plans for a low cost but in Mobile Data, there are hardly any plans that offer unlimited connections without any FUP.
The last thing is the reliability, mobile networks are not at all reliable for advanced users. The speed and ping of mobile networks fluctuates a lot and depends on the signal strength. Whereas in the case of broadband, you get constant and faster speeds. For doing stuff like online gaming, Mobile Internet cannot be relied upon.
No all users don't really dont. If you have highspeed internet and you share your internet with masses then its smart routers are useful. Smart routers are there to manage network uses among many known, unknown users.