The last straw was the fanboys at the linuxquestions forum. It was cultish and creeped me out.
Slackware doesn't do "security theatre" updates. Whenever there's both a credible risk and a reasonable fix, you'll see an update, and it'll be quicker than distros that are multiple steps downstream from Debian.
I realize that sounds like someone talking about a bad marriage, and I suppose we can generalize usefully on relationships of whatever type.
I think we must end up with longer-lasting bad feelings about anything we used to value.