>Does that mean that all the internet registries no longer allocate
>/24 (or longer) prefixes that have nothing to do with the actual
>Internet topology (these prefixes aka "portable addresses") ? Perhaps
>folks from various Internet registries would be able to answer this

I assign /22s to ISPs. When they use them up I give them another /22.
Private companies that show a need for a /24 are assigned a /24.

Ah. here is the rub. When you ISP buddies come back, you should ask
them to return the origianal /22 for a /20. That way, the total size
of the routing system stays the same!