IMO as soon as they realized the weather had turned they should have been up on the step heading back in. 20/20
I'm betting that just reading the weather forecast before leaving is an even better idea, and quite a bit cheaper than a PLB.
A little practice is useful since the forecast may off a little as to just how far a weather front will go in the next 24 hours. But it's rare for weather to appear out of nowhere so checking forecasts a couples hundred miles around their plan would likely have revealed a problem before ever getting on the boat.
I'm betting that is this case the most important part of Preparedness is Avoidance.
I'm all for having an EPIRB and/or PLB. In this case, it might have been a good idea. I've been sailing on smaller calmer bodies of water and made sure the EPIRB was working before we left.
But checking the weather before you leave and regularly while out, out at sea, out in the middle of the woods, out anywhere that weather can really change things for you, and even just making sure you check at home once in a while is a steller idea. If you are not listening for weather reports, how do you know if the weather in the near future is something that might be threatening, you or anything about which you care.
But I'd also recommend learning about and paying attention to weather patterns. It can often be very helpful, sand sometimes it can save your bacon, if not your hide.