we do not design engines to accept any ammount of rain at take-off power, potentially also ingesting additional water from the nose wheel spray.
The higher the power to more easier it is to ingest rain.
With today's engines the majority of the rain is centrifuged by the fan or diverged behind the fan to not pass through the engine innards. More fan RPM at slow speeds shields the compressor more. In flight low fan rpm and high air speed drives the rain droplets straight.
The cycle of the engines is also important as it affects air to water ratio and the energy needed to process the rain to a gas. Thus the higher the power is good.
Many other considerations enter into this in flight conditions