You say, if the glue is weak, doesn't that defeat the purpose? But that's where smart design comes in: you can design the interface of the two parts so that during actual use of the device, the glue joint is always pushed on from the outside, pushing the two parts tighter together instead of trying to separate them, while during disassembly (when the electronic guts of the device are already removed) it can be pushed on from the inside. However, the weak glue solution still leaves the problem of glue-gunk on parts that you want to recycle.The bottom line is that you should avoid them when you can (Remember, "screws better than glues"), but the info in Jeremy's post is a good primer.
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