Turning off Safari Suggestions is one of the first and most important privacy tweaks on a new iPhone. Otherwise every keystroke you type in the address bar gets sent to Apple in realtime.
Really? No - there is no privacy threat surface with suggestions, unless you assume that Apple and everyone who works there is lying about it?
ref: "any information sent to Apple does not identify you, and is associated with a 15-minute random, rotating device-generated identifier"
[0]https://www.apple.com/legal/privacy/data/en/siri-suggestions...