I have had 1/4" plugs blown right out of the jack in the speaker cab from the sound pressure waves. I'm sure others have also. Not the best thing for a tube amp. Don't have much experience with Speakons so nothing to add there.
Dang! I take it those weren't ported cabs. They also had a lot of speaker excursion going on.Never had that happen, personally. Impressive. Probably very loud.
I've never had that happen either. Can't imagine it happening with a ported cab.OTOH there's nothing that hard about using a Speakon connector.
Robert Plant and Jimmy Page (drummer and bassist of Deep Purple, Jake!)
I can't tell you how many times I have had road crew,sound men or whoever mucking around behind my rig and tip my cables out. Usually easily repaired with a soldering iron. Can't do that with Speakons.
The Speakons that I have can be connected using just a small screw driver. I find that a lot easier to fix when you're on the road. I don't always have a soldering iron at hand.