It's like that in some places. Typically, the consequence is that you'll get a phonebook-sized file in no time, with so much cruft accumulated from prior encounters that the file will be next to useless.
This is a great point. As someone who receives a lot of medical records from various exports, I can just say that hundreds of pages for a healthy 11 YO only makes it easier to miss the important parts.
This just seems like lazy doctoring compounded by busy schedules. If you can't summarize what's going on succinctly, what was the point of all that training? God forbid you spend a little more time on patients.