What's the most petty/pointless/pedantic hill you're willing to die on?
For me, it may be that the toilet paper roll needs to have the open end away from the wall. I don't want to reach under the roll to take a piece! That's ludicrous!
That or my recent addiction to correcting people when they use "less" when they should use "fewer"
I have given up on "steep learning curve". A learning curve is proficiency on the Y axis against time on the X. A steep learning curve indicates something that is learned very quickly. A shallow learning curve is something that takes a long time to master. See Ebbinghaus 1885.
I always view that one as meaning that you must learn a lot about something in a short amount of time in order to use it effectively, where shallow learning curve, in a positive context, would mean you can make it useful without knowing all that much about its full capabilities.
It's learning over time, with proficiency being the area under the line. It's describing having to learn a lot to achieve the same proficiency compared to something with a shallow learning curve.