Not dropping out, but on the factory frets on one of my Fenders, the 21st fret just popped up one day, without me doing anything to cause it, and the neck was at least 10 years old at the time.
I did a fret level on a customers guitar, everything seemed solid (no glue used on factory frets). He gets the neck back and the 14th fret pops up on the bass side. I had to eat the shipping for him sending it back, fixing it, then returning it.
So yeah..... I LIKE THE FREAKIN' GLUE !
I think super-glue makes the wood in the slots stronger, so there's usually less chipping when frets are pulled with heat. I think once those slots have been strengthened with super-glue, and frets always taken out correctly, there should be no end to how many fret jobs that board can handle (I've read old repair books where they were against gluing frets, and at the same time said a fret-board can only take so many refrets before the slots are too chewed up, etc)
But I always coat the wood with accelerator first, so the glue doesn't seep so far into the wood. I like to keep things right where they're needed (at least stuff that tends to go soaking as far as it can)
I do think a quick cure epoxy or any glue that doesn't dry brittle hard could cause a loss of good tone.
I do like to crimp the tangs if the frets are fitting loose. * I don't like solely relying on glue to hold down a fret *. Glue to me is partly added insurance and a air-space filler and seems to help eliminate "dead spots". I've had many people say their neck "came to life" after I refretted it, and I just assume the brittle super-glue might be part of it ( I don't care a whole lot if that's the case or not)
Actually I think Frank Ford came up with the fret tang crimping pliers. Dan made his own mod to that tool, and also Stew-Mac came up with another version.
I like to surpass things when I can, so I came up with my own tang crimpers. I just had to have an adjustable stop so I would get a consistent crimp all along a fret (If that's what I want).
And I also thought, why not have interchangeable carbide punches, so sometimes I can punch a small dot in the middle of the tang, and other times crimp the whole tang from top to bottom, or whatever.