IIRC, and may have already been mentioned, 'Travel Ready' was developed to deal with COVID, not immigration/emigration/security issues per se. It is based on TIMATIC, the 'bible' for passport and visa requirements. I'd enter passport info and a scan of my passport. Travel Ready would then check both visa AND COVID requirements of the country I was transiting or entering. If a visa was required or the completion of a health app (as of last week, still have to do that for Philippines, BTW), or a negative COVID test, Travel Ready would determine all of that. In no case, did it relieve me of having to present my passport when requested. Also the airlines were being extremely cautious during COVID. For example, in 2022, I did IAD LHR on UA (with a green Travel Ready), and then LHR VIE TGD on OS; on one ticket. The OS agent still required papers in hand for inspection prior to boarding as the Travel Ready information does not transfer between airlines. In late 2021, I traveled to GUA on UA, and again while I had a green Travel Ready, the GA double-checked all of my vaccination status prior to allowing me to board.

I like Travel Ready. Rather than using the TIMATIC tool, it advises me if my passport does not have validity, or a visa needs to be uploaded etc. I can start this process well before check-in. I haven't run into it yet, but I understand it also flags needed vaccines (not COVID, but yellow fever, for example).

In no way was Travel Ready designed to skirt any of the seemingly random secondary security requirements.