Wiggy, Im perplexed. No one's suggesting the crew should have provided an explanation. 'Please feel free to worry about flying the aircraft,' That's probably why the OP asked here rather than storming the cockpit.
He asked on a spotters forum. Spotters hang around airports, listen to ATC traffic, report movements. Its not unreasonable to ask is it?
And you can't have it both ways. Criticise a question for its lack of insight but then expect them to know just how much trouble seemingly innocent questions can cause.
Frankly if you are a professional hanging around a spotters forum you probably need to expect the odd question that makes you slap your forhead without reaching for your heart meds.