the engine is going to easily cope with the volume of water, since it can cope with thunderstorm levels of rain) -
Not always. A Garuda 737 Classic had a double flameout due water ingestion when inadvertently penetrating a 70,000 monster CB over Indonesia and unable to relight. Did a dead stick ditching in a river. Analysis from the CVR revealed the noise from the rain hitting the aircraft was something like ten times heavier than engine certification tests. Figures from my memory of course so could be inaccurate
https://en.wikipedia.org/wiki/Garuda...sia_Flight_421