As written by others: Anti-tamper and proof of tamper. Not only can you make it harder to open the case, but you can also intentionally use bits for manufacturing that are non-standard(e.g. leave a little bit of the inner or outer part out) and when you get a device back that has a fully used screw you can tell the customer to fuck right off with their claim.
Especially for medical devices that is sometimes done - and tbf,understandable as there are devices that really really shouldn’t be opened by anyone who is not manufacturer associated.
As written by others: Anti-tamper and proof of tamper. Not only can you make it harder to open the case, but you can also intentionally use bits for manufacturing that are non-standard(e.g. leave a little bit of the inner or outer part out) and when you get a device back that has a fully used screw you can tell the customer to fuck right off with their claim.
Especially for medical devices that is sometimes done - and tbf,understandable as there are devices that really really shouldn’t be opened by anyone who is not manufacturer associated.