The reason for blow ups is bad design. It you can manage to blow up a primer on the 550 only one will blow, not the entire tube mag.
Primers can be totally mangled and if there is no shock involved they will not blow. Put a primer in a vice and slowly crush it (always assume it will blow for safety). As for arrogant I call them like I see them. I am not a Dillonite
But I do have 2 Dillon presses. The one that blew was brand new and spotless. The issue is not a single blowen primer, the issue is that if you do blow one it will take every primer in the press with it.
Hang on here... are you saying the 550 doesn't use a tube full of primers? I don't have a 550 but I do have a 650 and a 1050. They both use a mechanism where the primer drops into a hole on a carrier and is transported to the priming station on the press. The 650 uses a circular carrier and the 1050 uses a linear but they both move the primer away from the tube (obviously) to line it up under the shell plate. The only way a primer will go bang and ignite the tube is if it doesn't fall flush into the opening on the carrier.
I'd love for an explanation on how the exact same gravity fed process on a 650 is inherently more dangerous that the 1050 or 550. If you blew a primer that took the tube with it on a 650 you either had dirt on/in the primer carrier, you had a misalignment of the primer magazine and the carrier causing a primer to drop into the carrier sideways or you didn't have enough pressure to drop the primer into the carrier.
Either way you look at it, the physics of how pretty much all Dillon primer systems is the same and if you blew up a tube you did something wrong.