And nobody has invented magic bullets.... why, exactly?
Or, wands of magic-missile are an "uncommon" item, daily self-recharging - why isn't every SWAT team member armed with several of them? I mean, you literally cannot miss the freakin' target with those!
And so on. The problem with the urban fantasy genre, as compared to our usual fantasies, is that you no longer have low population densities to blame for not having people to craft things. In a modern setting, wouldn't there be schools to teach you how to craft magic items just like we have them to teach the plumbing, HVAC, and electrician trades?