Every new service or process that wants to listen on a NIC would lead to a new ip address created for the same machine, which in turn leads to updating of all possible routers of the internet, which would be a useless waste.
I do not think this would be so - you would still be under the same route summary/network prefix advertised to you by your ISP's gateway :> Not everyone would get an IPv6 address like this so I do see the waste otherwise ~