I agree it seems a waste of time to fill out an app when all the info is already on my resume, but I imagine there are people whose resumes aren't very comprehensive.
I started filling out an app a few months that asked for weird things, like the name of my HS and when I graduated. In the job history section they wanted to know general things like my hourly wage and street address of past employers (?). There was no place for specific teaching qualifications like which subjects I'm certified for, nor which state I'm certified in. Then I realized it was just a generic job app, more suitable for a fast food job, that you can buy a pad of at Office Depot. I quit filling it out and dismissed that school.