Dr Reedalldabooks,
Have a look at the 10nm MSA. How many are not valid for 360 degrees around the station?
Then look at the plethora of 25nm MSA that are sectorised, as opposed to 360 degrees around the station and ask yourself the logical question; "If the 25nm MSA is the lowest level in a given lateral piece of airspace, that gives a minimum 1000' obstacle clearance, how can the 10nm MSA possibly require a pilot to climb?"