The front door key is the primary level of security for the building and protection of occupants’ property.
I think the OP was referring to the front door of their unit, rather than their block. In the latter case, your observations are totally valid. Electronic is the way to go – that way you can cancel keys when residents leave and do an annual audit to make sure there aren’t too many spares floating around.
Electronic locks on apartment doors need to be suitable for the type of fire door you have installed, your fire company will need to see the lock has been fire tested so as not to have you fail your AFSS.
I can recommend chris@electroniclocksaustralia.com.au if you are seeking advise for what electronic locks are suitable for your type of fire door.