If an app is used with a non-default timeout, but someone is either unaware of the want_timeout parameter or explicitly does not wish to make an assertion around it. Just biasing towards explicit > implicit per BDFL. Implementing the suggested behavior would implicitly check timeout. It also adds assertions to existing tests, whereas the original implementation results in no change to existing tests/assertions.

For a concrete example, if I removed the TEST_TIMEOUT from test_get_user_with_timeout, the test would fail, but, IMO, it would not be readily obvious just inspecting the test function why (nowhere did I make an assertion or ask an assertion to be made around timeout, so why is that happening?).