The trouble is, security fixes (generally) don't get backported to older branches. If older branches are even a thing. Say you're on Foo 1.4.7, and the jump to

The trouble is, security fixes (generally) don't get backported to older branches. If older branches are even a thing. Say you're on Foo 1.4.7, and the jump to Foo 1.5 includes a feature re-org you don't want, and no security fixes. So you hold your version on 1.4.7. But then a security issue is found, and Foo 1.5.1 is released with a fix. Is the version you have vulnerable? Maybe, depending on where the bug is. Is there a 1.4.8 update to fix it? Maybe not. How would you even get it? Heck, if you've switched off automatic updates, have you even heard about the 1.5.1 release? Are you checking on the release announcements for Foo to find out if there have been any security updates, ever? OK, maybe you check those things. But do you think J. Random User who saw a post on Reddit that said 1.5 sux0rz and they should stay on 1.4.x is going to? And do you like having botnets? Because that's how you get botnets.