Turn off Start menu suggestions

HKCU\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager\SystemPaneSuggestionsEnabled = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager\SubscribedContent-338388Enabled = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager\SubscribedContent-338389Enabled = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager\SilentInstalledAppsEnabled = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager\SoftLandingEnabled = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager\PreInstalledAppsEnabled = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\ContentDeliveryManager\OemPreInstalledAppsEnabled = 0
HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Start_IrisRecommendations = 0

Before anything is written, the review screen shows this setting's current value on your PC next to the new one.

A cleaner Start menu and no silently installed promoted apps.

None.

Strong evidence means: documented by microsoft or consistently measurable. Expected impact is small (1 of 3): how much it can matter when this is actually the bottleneck on your PC, not a promised gain.

Yes. It's in the Debloat pack, so that pack and Optimize everything include it. You can still untick it in the review screen.

Switch the tweak off in Nexus, or open Restore Center and restore this change (or choose Undo last change). Nexus writes back the original value it recorded before applying, not a generic default, then reads it back to confirm.