It’s a physics thing.
The angled blade means the initial point of contact channels all the same force into a smaller initial contact patch and is cutting less of the neck at virtually every point of the cutting motion of the angled blade than a straight cut would.
You have more cutting blade go through the neck as the hypotenuse (Angled blade) of a triangle is longer the the sides (Straight blade).
The same reason scissors are: They shall cut, not chop like a butcher does with his axe. A Guillotine blade is cutting through a neck starting from aside. Skin is chewy and flexible and therefore has to be cut, not chopped. The spine is hard and has to be dismembered with force and the blade must have enough speed for that. To cut through he remaining parts, throat and venes is easy.
Shall I go into the disgusting details?
In addition to making a cleaner/more reliable cut, having an angled blade also places less stress on all of the components of the guillotine. A straight blade means all of the force is taken up in one big WHACK when the blade hits, meaning shocks go through the blade, the housing and the upright rails all at once. If the blade is angled the force is felt over more time, even if it’s like, a tenth of a second, it’s still better than the alternative.
Less blade sharpening, less maintenance in general.
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