Respectfully I don't think they explained it well.
fc00::/7 is for "Unique Local Addresses". Basically, private, non-globally-routable addresses from which you can freely pick space. Kind of like RFC1918. It's deliberately huge and you should only use as much from it as you need. The idea being that if you merge with another organization or connect to them via VPN, it's unlikely your addresses will collide like with RFC 1918.
There's even a website (sites?) to register your ULA space on a volunteer basis to reduce collision chances.
If you can't remember 192.168 you definitely can't remember a randomly picked ULA. So just use fd00. It's not any worse than 192.168.
True, I was thinking more about the allocation discussion than the "easy to remember".
Anyone in IT who allocates 1.1.1.0/24 because 192.168.0.0/24 is hard, should be allocated to trash pickup.