Flattening Rust’s learning curve

A learning curve measures time on the x axis and progress on the y axis.

A flat learning curve means you never learn anything :-\

You may be able to draw one that way but it completely neglects the way people use the term ordinarily “a steep learning curve” is not an easy to learn thing.

In point of fact, I think the intended chart of the idiom is effort (y axis) to reach a given degree of mastery (x axis)

I don't think the idiom has in mind any particular curve. I think it's just another case of a misuse becoming idiomatic without any meaning beyond the phrase taken as a unit. E.g.

- another think coming -> another thing coming

- couldn't care less -> could care less

- the proof of the pudding is in the eating -> the proof is in the pudding

It's usually not useful to try to determine the meaning of the phrases on the right because they don't have any. What does it mean for proof to be in a pudding for example?

The idiom itself is fine, it's just a black box that compares learning something hard to climbing a mountain. But learning curves are real things that are still used daily so I just thought it was funny to talk as if a flat one was desirable.