Some of the One Click Install apps are using outdated and insecure versions and heck the Mediawiki isn’t one click at all because despite it downloading source and uncompressing and creating a MySql DB it makes you go get those details and manually enter them.
Mediawiki on Dreamhost Version: 1.24.4 (Years outdated)
Current Stable Version: 1.26.3
PHPBB on Dreamhost Version: 3.0.13
Current Stable Version: 3.1.9
Joomla! on Dreamhost Version: 3.4.8
Current Stable Version: 3.5.1
Upgrading the versions you offer on one click isn’t just about having the latest and greatest features its also about support for things like PHP 7 which Dreamhost now offers and optimized code which means apps run better on a shared environment.
But most importantly security! DreamHost really should revamp its One Click Install system so it automatically updates to the latest stable versions of apps it offers. Also Dreamhost should add more apps and do autoupgrades of installs much like most shared hosts do.