ETA: I only noticed yesterday because a "sponsored suggestion" popped up when I was typing, which I've not seen before. So either they actually enabled it recently, or advertisers don't bid on the kinds of things I usually type.
ctrl-l is for the address box
At most I want the address box to do is look up a dns name. Which can still be a risk if I were to hit "enter" with sensitive information which could in some cases get pushed out to my DNS provider (which is me, but then it's possible the address would be pushed out to another resolver, and will also be logged in an unexpected place)
I've always have a suspicion that even with auto complete off, some sort of telemetry or obscure feature is still leaking browser address bar text.