I agree with half of this post; although I don't experience any slowdown on my iOS device, I too don't understand why it's called "Siri Suggestions". I don't know what context "Siri" uses to suggest apps and often find the apps there are just ones I use frequently and some random ones.
Overall, the feature it a wash for me.
I listen to podcasts every day when I leave work at 5pm. Around that time the podcasts app shows up on my lock screen. It "learns" your habits and makes suggestions based on usage patterns (not necessarily frequency). Some weeks/days I'll listen to spotify and it will suggest that app instead.
There is additional code that will trigger apps based on your location. Every time I pass by a Target or Starbucks it suggests those two apps.
What I"m curious about is if "frequent locations" in system services is also used to determine the app and I know how people here LOVE to turn off every location service. I keep everything on.
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Basically apps just pop up at the bottom of the screen. It slows down the phone and it's never an app that has anything to do with what you're doing at the time. It just sits there like an ad.
And why do they call it Siri suggestions. Siri is not doing anything. If you ask her about it, she doesn't know what you're talking about. ¯\(°_O)/¯
I want to get rid of it.
Apple uses "Siri" to describe artificial intelligence in iOS. The portion of iOs that tries to "learn" your usage habits and make suggestions.