USB drivers are very important, as without it you won’t be able to connect your smartphone to your computer.
Doesn’t matter you are going to use your smartphone for development, or to flash a custom firmware or to simply transfer files, without USB drivers these are not possible.
Most of the smartphones install drivers onto your computer when you connect them for the first time. But over the time, they get outdated. This is why you need updated drivers. Without latest drivers, problems might occur while performing root. Before rooting any device, it is always recommended to install the latest smartphone drivers.
For Samsung devices, the USB drivers are available on their support website.