In my understanding
tropical storms have a lot of energy esp at lower levels.
Like Tagor sys, Lateral separation is often the best.
While at low altitudes, the speed margin is more, so is the severity of turbulence and icicng esp at SAT above -40 deg C
Further in Europe and in any monsoon type of weather, at lower levels one would definitely be in icicng conditions for a longer period of time .
I suppose it would be a calculated risk at the time to go around a storm (if you can vertically?) vs through it.
Hope this helps...