TAC sadly is a log parsing gig, and that creates a big problem, if the issue is not in the logs, or if it cannot be logged for TAC it does not exist.
Forgetting that getting certain logs cannot be collected in a busy operating networks
Forgetting that by encrypting traffic you cannot collect the logs you want
Forgetting that logs are not always deterministic in root cause analysis, knowing how a network operates and knowing the impact and seriousness on end-user experience of a failure
What is the benefit of escalating Cases to P2, if you just end up with a non-ending stream of Tac engineers in a 4h shift rotation, that cannot fix or identify your issue, just to end up in a month long BU escalation with Dev accessing the environment and running custom scripts on a root shell?
Just because Cisco BUs use agile dev, and software quality assurance and testing is a mirage?
1 thing is for use as long as Cisco uses Customers as testbeds to test 0 day software, customers will not implement latest and greatest, regardless of the security narrative.