The System Preferences page recommends running:
bashdefaults write com.apple.dock workspaces-auto-swoosh -bool NO
This disables automatic Space switching when using Command+Tab, which completely breaks the ability to switch to full-screen apps. The app switcher appears but nothing happens when you release.
This is especially painful on multi-monitor setups where full-screen apps are common.
I'd suggest either:
Removing this recommendation entirely
Adding a clear warning about what this breaks
Explaining why someone might want this (I genuinely can't think of a reason?)
Took me way too long to track this down as the cause.