I can understand switching distros to have a different init system, since doing it manually would be impractical, but you can easily avoid Wayland in any distro... What does Slackware have to do with it?
It's become increasingly difficult to avoid systemd, making Slackware one of the few remaining reasonable options for that. My comment is (half-seriously) imagining that in the future Wayland will attain a similar dominance, in which case Slackware is likely to be one of the leaders of the resistance!