When I first started working as a Basic, I had FTOs and EMT partners who taught me things that I've since found out were just flat out wrong. I think this is part of the reason why many people with a lot of EMT experience do miserably in Paramedic school. They developed a bunch of bad habits and got some false notions stuck in their heads that are hard to get rid of.
The farther I get in Paramedic school the more convinced I am that EMTs should be pretty much limited to driving the ambulance and not much else.
Then you wind up with a company like mine with a system that makes the Paramedic tech every single 911 call no matter the C/C even the stubbed toe at 3am, and you wind up with a bunch of EMT-I's and AEMT's with very limited tech experience and are stuck driving every call every shift until they become Paramedics then their just thrown to the wolves with an "upgrade" program that last 1-2 months.