In today's world, it is very popular to use wireless Internet connections instead of traditional ethernet connections. However, when you look at a company like Netsys, you will find that this popularity is not totally grounded in the fact that the wireless systems are better. They have just risen to this popularity because they eliminate cables, but the product, at the end of the day, is far worse.
You see, by not using cables, you drastically reduce your own Internet speeds. The speed that you get from your cable provider may not be up to what you were looking for in the first place, and then a wireless router takes it down another notch. For places where many people are going to use the network at once - this could even just be your home if you, your wife, and both of your kids are going to use the network at the same time - this could make it too slow to function.
A wired connection is much stronger and more robust, and it offers the fastest direct connection that you can get. Sure, there are some places where this is not an option. If you run a coffee shop, you cannot have wires going out to all of the different tables. For most business settings, though, a wired connection is far better. In your home, if you have a desktop computer or if you always use your computer in the same place, you also want a wired ethernet connection.