Huh? The pictures in the last link clearly show that the plastic joint that is the cause of this recall did not fail in that instance. While something clearly went horribly awry there, it wasn't related to this recall.
The
article linked with that tweet includes a picture, which if you read the text, was caused by customer abuse. ("Bumped" meaning "torn from the wall".)
At least in theory, glue is a perfectly valid design choice - many glues are stronger than the materials they are joining, and of course with plastic there are "glues" that in fact are nothing but solvents that just dissolve the plastics and wall " them together. But I'd always assumed it was ultrasonically welded. If you've ever tried opening any of the AC adapters these plug adapters go in, you'll know you absolutely cannot pry apart the seams, you must Dremel them apart, and I've never seen anything that looks like adhesive residue on the seams.
There's also another big question: Apple designs these, but contract manufacturers build them. There is - however unlikely - the possibility that the design specs were not always adhered to 100% by the contract manufacturer.
And finally, just because some customer
said it was glue doesn't mean it actually
was. They might not know what ultrasonic welding is, for example. Or there might be some actual glue used to hold the pieces together prior to ultrasonic welding, but that isnt expected to provide any strength after welding.