remoak, you fly your aeroplane, I'll fly mine. My company does not require, or even suggest, the captain's presence at the door during boarding. Space would be an issue anyway.
Furthermore, during a 25 minute turnaround, the loss of briefing time would be a great way of delaying the flight.
As for uniforms in general, David Lid Air, spend a few years wearing them, observe the year-on-year deterioration in quality as each successive replacement is bought from a cheaper supplier, and then let us know if you are still so keen to be seen in it. Our uniforms are so cheap they have to be replaced every 18 months- even then, after about 7 or 8 they start to look very tired indeed. Two pairs of trousers and one jacket is not enough to be able to cycle them around and keep them looking good.