Teeth serve two purposes- catching and chewing/ripping/tearing.
Long fangs are for catching. Cats don't really chew food, nor do snakes. Both rely on their teeth to stab and hold prey, which is why they are sharp like needles.
Our cutting teeth are for slicing and chewing- in other words, processing the meat after it's been caught. The 'massive predator fangs' take care of catching it, but have you ever eaten meat without biting off a piece, ONLY cutting it up into little bits and chewing it? There's a reason that's relegated to high society, it's not worthwhile for everyone else, and it'd be ridiculously hard with stone tools.
They cut it up into bite-sized pieces? I really doubt that. Notice only people who worry about etiquette tend to do that, and I don't think etiquette existed when we were cutting things with rocks. Perhaps chunks were sliced off, but I can't help but laugh at the thought of a Stone Age man cutting his meat into little cubes.
As a further argument, notice how most people eat a drumstick? It comes naturally.
Long fangs are for catching. Cats don't really chew food, nor do snakes. Both rely on their teeth to stab and hold prey, which is why they are sharp like needles.
Our cutting teeth are for slicing and chewing- in other words, processing the meat after it's been caught. The 'massive predator fangs' take care of catching it, but have you ever eaten meat without biting off a piece, ONLY cutting it up into little bits and chewing it? There's a reason that's relegated to high society, it's not worthwhile for everyone else, and it'd be ridiculously hard with stone tools.