You have a bunch of Wi-Fi devices which talk to the "cloud". The Samsung App lets you set up a cloud account which can run various routines over the internet. So a sensor might trigger a routine on the Samsung servers that then talk to a device's cloud server telling it to contact device in your house and turn on.
As you can see, that's a lot of communication over the internet. If you want faster response times and less dependence on an always-on internet connection, you can get a local hub that talks locally over a Z-Wave or ZigBee mesh of devices.
The Samsung Station can support ZigBee (but not Z-Wave) and Matter devices. So if you were planning to change devices you might find a benefit to having a local hub.
Currently it seems like you don't need it, but you could start building a network of local devices running ZigBee or Matter. You can still have your existing Wi-Fi devices but have any new devices working locally instead.