While I agree that a tune is a no brainer, the front O2's being wideband still keep things in check. We're not saying your wrong and you are certainly entitled to your opinion about email tunes but there are also many many happy clients of email tunes, even with long tube headers and have spot on ratios.
I said I would not trust a canned tune without checking the AFR on the dyno. = For my peace of mind. I did not say I would not run a canned tune and I think they are great for most consumers.