And that's just tools. The International Building Code changes every three years. So do NFPA standards - there's hundreds of them. Fail to keep up to date and I can get sued. Personally. There's no corporate protection for anything I seal. My ass is on the line. My house is on the line. My bank account is on the line. Please. I have to have a license because people may die if I fuck up. It's not just a fail whale.
Like I said I deal with the demon spawn - an owner using uncertified welders to install seismic components to save a few bucks isn't surprising. They see one little piece of the picture. Maybe he even outsourced the spec to the company doing it for free. Those specs probably didn't require a special inspection.