It sounds like Apple might be doing do this all via email, no case management software. That would be pretty bad.
You can’t automate handling of bug submissions unless they’re semi automated (crash reports , spintracer, etc get coalesced, and high volume ones get higher priority).
But people filing bugs themselves? That goes through triage to filter out unactionable bugs and send to correct engineering teams.
Those then gets screen by either (if the team is big enough) and dedicated screener, to the right sub component or engineer.
That all takes time, and is unavoidable