I have an extremely stupid question about present perfect vs past simple. Imagine the following situation:
I want to take a shower, but the water is cold, so I want to postpone it then until the water gets warm. I then text right in that moment to someone saying "the water is cold, I'm going to wash myself later" or maybe I could text someone like 10 minutes later and saying "the water was cold so I couldn't take a shower". I'm using here both simple present or simple past (because it's natural to me).
Following this link however it sounds to me that if I said "the water has been cold" would be "correct" (but not natural actually). Am I right? If I'm wrong why am I wrong?