Sure, if you have the depth to do a deeper cabinet. Bathroom cabinets usually have 22" deep counters, and kitchens have 24" deep counters. The kitchen cabinet will give you a 36" high counter top. This is becoming more normal for bathrooms, but kiddos will need step stools longer. If this is a master, the 36" height is becoming normal.

Rubusj, does that mean that you are going to have 4 ft deep counters? If yes, will you have access to them from both sides, as in a kitchen island? If not, how are you going to reach anything that goes further back on the counter than you can reach?