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Too many large-scale tests can be a burden. So when asked “Should we write a test for this?”, I would of course respond that “It Depends”. I think it depends on three factors:

1. How easy is the feature to test?
2. What is the likelihood of the feature breaking?
3. What is the impact of the break?

A static link in a webpage is easy to test, but is unlikely to break. If you had contractual arrangements that a ink appears, the impact of a break is severe.

A data centre going down is a pretty serious impact, but not only is it unlikely, but it is hard to write an automated test for it. So here, a manual test is probably a more sensible use of your time.