I’ll say it again, my company introduced FA’s coming into the cockpit during toilet breaks after Ballistic doors and key pad locks were introduced 15 years ago. It made sure access was available at all times for incapacitation issues without having to wait the 30 seconds time delay......
Since then we’ve NEVER had any problems at all with security or FA’s bumping switches......it just hasn’t happened.
You might as well ban anyone coming into the cockpit during flight but you’ll need a small galley, toilet and crew rest facilities installed in the cockpit. That ain’t gunna happen is it. So until then those pesky fumbling possibly mentally unstable FA’s will have to come in many times during flight, so live with it.....