internet routing table in a vrf

hi I would to enquire about the cons/pros of running a full internet routing table in a vrf and the potential challenges of operating it in a VPN cross a large network that does peering and provide transit. I not a fan to support running it in a vrf. I am looking for a list of operational and technical challenges specifically around 1) control plane (route reflectors ) 2) forward plane (recursive lookup issues) 3) Operational 4) DDOS 5) BCP and RFC that would break eg "BGP-SEC does not support in todays draft to check prefixs within the VPN" 6) Vendor specifics