@amoun: Although my question was directed to Rae, thanks for your knowledge.
Please link to the source of this information! To avoid spreading rumors or wrong informations. Thank you.
For many people the unknown-caller-bug is more than just an “inconvenience”. Especially when using the phone for business and on-call-service, where you sometimes have to differientiate between customers / company-internal / private calls before answering.
And don’t forget about DND mode, when you silence your phone at night, but important callers has to ring (elderly parents, company emergency, your pregnant sister, whatever). DND is not able to work without the caller ID and these important callers go silent.
This even could be dangerous - at least this is more than just an “inconvenience”, depending on the way people use their phone.