These settings suggestions are always irrelevant to me too 
Here is the workaround I found. (You should be comfortable using a command line probably):
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The package name of the Settings Suggestions is com.android.settings.intelligence
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Using this guide from XDA, I was able to uninstall the system app:
How to Uninstall Carrier/OEM Bloatware Without Root Access
Note from the guide: Even if you uninstall a system application using this method, you can still receive official OTA updates from your carrier or OEM. -
The result is that the suggestions are gone, but the bar for nightmode and muting etc. is still there:
