As for the 2020 closeness, that happened because, on the surface, Biden took the 2016 3rd party percentages. Trump's percentage is identical between the two elections.
Below the surface, we don't know the puts and takes. And the fact is, Trump's percentage didn't rise.
Complacency isn't a good trait. I totally agree, that people in "forever Red" states should never play defense. The enemies of freedom do not rest. Or, as an old Russian Orthodox saying goes, when God builds a church, the devil pitches a tent across the street.
Look down the ballot. Too many were too close, IMO.