Here is my reason for not being interest after endgame:
It was called infinity war, with infinity stones that let you do anything. Given that it was executed well, there really isn’t anywhere else you can go from there.
I thought they were gonna change their pace and maybe take some artistic risks.
Nope, multiverse now, making things far less consequential (ironic cause they used time travel but without changing the past being an option).
I disagree with the author though, you can still enjoy good films as standalone if they truly are good films. Guardians 3 was spot on.