Well, 7-year-olds don’t know a lot of math, typically, so I wouldn’t ask one that question. “Linear” has a very precise mathematical definition, which is not “made of some straight lines”, that when used properly enables entire fields of endeavor.
It would be less confusing if you chose a different word, or at least defined the ones you’re using. In fact, if you tried to precisely express what you mean by saying something is “more linear”, that might be a really interesting exploration.
It's perfectly legitimate to discuss the linear aspects of piecewise linear functions. I've heard Andrej Karpathy do it in precisely same way I did on this thread, talking about ReLU.
We just have a lot of very pedantic types on HN who intentionally misinterpret other people's posts in order to have something to "disprove".
It would be less confusing if you chose a different word, or at least defined the ones you’re using. In fact, if you tried to precisely express what you mean by saying something is “more linear”, that might be a really interesting exploration.