There are definitely elements of the fire service that are - for better or worse - "this is the way it's always been done".
In some ways it works. It doesn't noticeably change your efforts or effectiveness, just your tactics, and now you don't need to question "is this a feature of this car?". Just like "what cars use extensive magnesium in the engine block?" or "does this vehicle have airbags? did they deploy? how about side airbags?" Just assume they do, and use a commonality of technique.
There's definitely a challenge between reconciling techniques that work in the field and textbook operations, and then keeping both up to date with the latest 'discoveries' - for instance forty years ago many fires were contained by a lack of fuel, nowadays it's a lack of oxygen (better sealing, even with ventilation systems) and higher fuel loads (petrochemicals in homes and furniture) mean that oftentimes by the time we get on scene you can have this home that is a darkened down box, thick black smoke with little or no visible flame, hotter than anything, and as soon as you open a door, you have about 90 seconds to get some cooling applied, or you're going to have flash over by virtue of all the oxygen you just supplied to this nascent fire.