Not all routes are created equal. If you have a PNI and an IX connection of equal capacity, obviously the IX connection will fill up first given that there is more opportunity there. Also, there are more moving parts in an IX (and accompanying route servers), thus more to go wrong.
From: "Mark Tinka" <mark.tinka@seacom.mu>
To: "Mike Hammett" <nanog@ics-il.net>
Cc: nanog@nanog.org
Sent: Thursday, January 31, 2019 7:09:54 AM
Subject: Re: Calling LinkedIn, Amazon and Akamai @ DE-CIX NY
On 31/Jan/19 14:59, Mike Hammett wrote:
Do people not know how to use local pref
and MED to prefer PNI over route server?
We don't particularly care how the routes are learned. Routes are
routes.
Our motivation for or against peering with an RS is granular policy
control, and the level of trust we can put in the stability of the
same over time.
Mark.