In respect of the short field versus soft field take-off, it would be normal to use a 'soft field' technique on grass.
Not sure I would agree with such a black and white statement, FOK.
There are considerations to trade off, e.g. sloshing fuel around tanks in a rolling take off, versus failing to accelerate.
The law of the situation disctates what needs to be in any particular instance, e.g. baking hot day, soil like concrete versus Febuary mudpatch
