Entranceways and kitchens can handle wood flooring. The problem with bathrooms is the extreme humidity changes. Every time you take a shower/bath, the humidity jumps to 100% or more (that's when it drips down the walls). Wood floors can not handle these sudden, extreme swings. The humidity is the very reason you can not install wood floors nor "fibre board" floors (like laminate, engineered cork, some types of vinyl planks, etc) in bathrooms. It isn't necessarily the "water"/spills...it is the HUMIDITY that is the problem.

Entranceways and kitchens rarely have these issues. If you would like to use wood in the bathroom, you can work with cork glue down tiles = 100% cork tiles = 100% water and humidity proof.