Re: Mapping plan
Quite a few Enterprises have valid reasons as to why they might want full routing table.
And I say that as somebody who has exclusively worked in the Service Provider sphere, never worked for Enterprise.
Although agreed it is not for everybody though. Many SPs themselves can do well with 2 or 3 x default route-only from different Tier 1 or maybe some sort of partial routing table mix from the likes of Lonap and Linx (assuming UK-centric ISPs).