In general the bar for making changes is: is it better that it was yesterday?

Before 1.10 `go test` used to re-run tests unconditionally.

Since 1.10 it'll avoid re-running them in some cases.

Neither me nor the announcement claims "intelligence".

The rules are simple and effective which is the Go Way.

While you could try to make even better, more "intelligent" rules for determining wether to re-run the tests, those would quickly run into engineering complexity chasing diminishing returns. That is not the Go Way.