Yeah, they like forgot to reupload a new cert 3 times.
And they hold packages back. EndeavourOS uses Arch's repos directly, whereas Manjaro has it's own repos. EndeavourOS is just Arch with a GUI installer and some handy prepicked choices, like a DE.
Why update on that little battery life left... the power will return sooner or later, going without updates even for a week or two is no real problem. Hell, I update like once every 3 weeks to a month, it's not that big of a deal.
Because if you're evolved enough to use Linux, you realize how shitty the human race is.