if(dirty || badBattery || badAccessories) { repair() }
   else { recycle() }

That said, most repairs are done offsite so anything they can’t do on the spot they just trade you a refurbished one and do it on their own time offsite.

I say “refurbished” but Apple calls it a “replacement” model. This seems like a distinction without a difference at first but Apple has two streams, “refurbished” and “replacement”.

The former you’ll see on their refurbished shop and might have minor signs of usage, the latter is used in their replacement process and always looks like a brand new one that you buy new (even though the fine print says it could have signs of usage).

I always prefer replacement over repair if I have the choice, because you’re essentially handed a new device.

In rare cases, > 3 coming back for the same issue, they’ll simply give you a new current retail model if your issue seems tied to a design issue in the model you own (e.g. this happened sometimes with the MBP GPU issue and later with the keyboard issue) so it always pays to keep badgering them if your issues aren’t resolved.