I don't want to participate in the discussion whether systemd and systemd-resolved are good or bad or for laymen or not.

My only point was if you want "to take control" of your system you first have to look /etc/nsswitch.conf. If "resolve" is before "dns" your /etc/resolv.conf is mostly unused. Any article discussing /etc/resolv.conf without mentioning /etc/nsswitch.conf is very misleading for many users who happen to have systemd-resolved (probably because the distro decided to install and configure it)