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After creating a subtheme (AT Subtheme), it is possible to disable the parent theme (AdaptiveTheme). This seems like an issue as a subtheme should require the parent to be active and should behave like a dependent module. My main issue with allowing base themes to be disabled while its subthemes are enabled is that when a new update comes out, it is extremely difficult to find out which subthemes would be affected by the upgrade or if a sub-theme even requires an update at all - especially while using Drush.
This is not strickly and AT issue as other themes allow this behaviour but I figured I'd start somewhere.