Short question: Since XCTest isn’t a system library (like Foundation is), is it open to evolution proposals?
Very belated answer: I believe the way to request changes in XCTest (or its Swift interface) is the same as Foundation's -- it starts by filing an issue in Apple's Feedback Assistant.
To do this, sign in to https://feedbackassistant.apple.com, select "Developer Tools", then select "XCTest" for the issue area. Your report will directly reach the folks maintaining the XCTest framework.
You can also start a new topic in the Development > Core Libraries forum.
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I see - it isn't the answer I hoped for, but thanks for clarifying all the same.