Why is the body of a flat chisel slightly tapered towards the cutting edge?
To prevent sticking in work
When a flat chisel is driven into a cut, its sides can wedge tightly against the walls of the groove.
The body is made slightly tapered, narrowing toward the cutting edge, so that behind the edge the chisel is a little thinner than the slot it cuts.
This clearance stops the sides from jamming or sticking in the work, letting the chisel move freely and be withdrawn easily.
It is not shaped that way to add striking force or a striking surface or to give hand grip.
Hence, the answer is To prevent sticking in work.
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