Samer,
The benefit to me of assigning a static IP address on the device is that, in theory, I always know what to type into Terminal when I am upgrading its firmware & software, and I don’t therefore need to do a network LAN scan!
I already have another device (a NAS) in my router that has a static IP, but, if I understand you correctly, you are suggesting I use the mac address of the device and reserve a range of IP addresses via DHCP for that mac address – right?