The argument against route optimizers (assuming appropriate ingress\egress filters) is a religious one and should be treated as such.
From: "Töma Gavrichenkov" <ximaera@gmail.com>
To: "Mike Hammett" <nanog@ics-il.net>
Cc: "NANOG" <nanog@nanog.org>, "Dimeji Fayomi" <oof1@students.waikato.ac.nz>
Sent: Tuesday, July 16, 2019 9:53:46 AM
Subject: Re: Performance metrics used in commercial BGP route optimizers
Most of which are bunk if you and your upstream have appropriate filters.
True, and, while we're at it, it's okay to drink and drive a car if the manufacturer has built enough driver assistance systems in it.
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Töma