My mentor used say it is the difference between a screw and glue.

You can glue some things together and prove that it works, but eventually you learn that anytime you had to break something to fix it, you should've used a screw.

It is trade off in coupling - the glue binds tightly over the entire surface but a screw concentrates the loads, so needs maintenance to stay tight.

You only really know which is "right" it if you test it to destruction.

All of that advice is probably sounding date now, even in material science the glue might be winning (see the Tesla bumper or Lotus Elise bonding videos - every screw is extra grams).