Have yet to try out a 30 minute boil, but I believe it would depend on the vigor of the boil as to whether or not those tasks will be accomplished.
I did 30 minute boils in my last two brews. No problems so far. The first one tastes normal, second one still in the FV. As far as I understand, the boil just needs to generate continual motion as the agitation speeds up chemical reactions. I'm not keen on very vigorous boils as i brew indoors - can get messy.
I brewed yesterday. I set up an overnight mash the previous evening. Full liquor volume & no sparge. No vorlauf needed as the grain bed had settled for 8 hours. Opened the tap to collect runnings 8:25 a.m., started boil at 9:00, flameout 9:30, finished chilling at 10:13. Painless and quick.
I'd need to see very strong evidence that beer is better brewed the long way as it would be painful reverting to 6 hour brew days - i just don't have enough free time for that at the moment.