Carol,

Please don't obsess about VERIFLY. Many people don't use it and make it through just fine. The man at the table didn't even ask us for VERIFLY, but once we told them we had it, a big smile came to his face and he said "that's easier". It personally saved us a minute maybe. So if more people used VERIFLY the line would definitely move faster.
And I stand corrected, we did not have to show the negative Covid test results as they were uploaded into the VERIFY app.

As for only using carryon luggage, someone posted this comment on TTOL a LONG time ago: After packing - remove half the clothes and take TWICE the money! I think it was something like that. And oh so true!