The whole issue with having the king's entire family slaughtered because it's too dangerous to have surviving royal blood around, though? No matter how "historically accurate" it is? It wasn't a problem ten minutes beforehand, when the country had just surrendered over a jousting tournament.
Like, forget some distant scion of the old order potentially causing a problem down the line, the literal crowned king of the country was going to walk off and retire unscathed, and nobody cared about that or worried about him potentially becoming a political enemy back then. The only thing that changed was the murder attempt. It's got nothing to do with quashing a possible rebellion - it's collective punishment, pure and simple.
for this particular story since everyone else seems to be waging war for sport making them worse in comparison.At that point, saying "it's just the way things were done" is meaningless - because fine, okay, if that's the way things are done, and the emperor is just going to keep doing things the way they were done, then there's no reason to root for him anymore. He's just another despot
It would absolutely be faster - but if, and only if, she could actually reach it in one smooth motion. That's my nitpick. People aren't made of jelly, and it takes a bit of force and momentum to stab someone, especially with a dagger made for combat. Pressing it in from point-blank range is going to be slow and agonising - and then she's got to rip it out again, because, as that quora link points out, getting stabbed is dangerous, but it's bleeding out that kills you.Re: quick death, carotid artery would actually probably be slower than stab in the heart area (up and through the ribs).