Well there are such restrictions on guns, try and get a short barrel rifle in under 30 min, the paperwork alone will take that long.
But also yeah those laws suck and shouldn’t exist. Much like the original intent behind CCW permits where the theory was “concealing is for criminals,” those knives were also seen as “for criminals.” It’s just old outdated bullshit that goes largely uncharged but can be used if they want to fuck with you. In some cases “criminals” was also synonymous with black people or even italians depending on the year lol, and were passed for racist reasons.