I never trust the AAgents in the AC to give me the correct boarding time and gate. Once in PHL an AC agent told me the wrong terminal and gate! I now do my own boarding and gate location “research” and get there at least 10 minutes before boarding time because I’d hate to be forced to gate check my bag and/or have my seat reassigned, as both have happened in the past. I don’t want to be left standing at the gate debating the specifics of the CoC or any other nonsense while my plane pushes back.