It sounds like the objection you’re giving here is that “some people will misinterpret expected performance in the technical sense as expected performance in the colloquial sense (i.e., my guess as to how things will turn out).” That doesn’t seem like much of a criticism though, and it doesn’t sound severe enough to throw out what is a pretty standard definition. People will also misinterpret your alternate definition, as we have seen.
It sounds like the objection you’re giving here is that “some people will misinterpret expected performance in the technical sense as expected performance in the colloquial sense (i.e., my guess as to how things will turn out).” That doesn’t seem like much of a criticism though, and it doesn’t sound severe enough to throw out what is a pretty standard definition. People will also misinterpret your alternate definition, as we have seen.
Do you have other objections?