The new colorscheme is base16 classic dark with the bright colors
generated with oklab toolkits. The base16 classic dark is less washed
out and represents the current maintainers preference. The motivation
to change it was subjective, though it does look like generic dark
theme.
On a side note, this colorscheme was used for alacritty.org web page for
a long time, however it used different foreground color.