timmmay: That's a weird limitation.
I can imagine someone at fritz central going:
WAN = 1gbit
4x LAN = 400mbps
WIFI = another 150mbps
which is significant, but darn annoying if you have just the one device connected that is gig capable.
For his next trick, I'm sure @solaybro will try to get sustained gig speeds from Vodafone during the day...