should there actually be "indestructible" weapons?

[whswhs]

Physically the answer is simply No. But dramatically we're choosing not to keep track of damage to weapons or shields or other gear because we aren't interested in that level of detail. If we've made that decision the physics is irrelevant; there's no point in discussing it.
If you don't like that, don't allow indestructible gear, and put up with additional complexity, I guess.