I don't think Josh has ever recommended Epcot for that reason; in fact, on days like Christmas, when a lot of people gravitate towards MK, he doesn't recommend Epcot either, but will recommend AK and DHS. He even explains that a lot of people will recommend Epcot for just the reason you mention, but that since Epcot doesn't have a lot of headliner attractions, it's actually not a good choice. He tends to recommend the parks that don't have EMH or parks that don't have something going on to make people gravitate towards it.
Definitely a Josh fan here. And I agree, his blog is pretty funny. Love his humor. Also if you read his crowd calendar he spells it out - says exactly why he recommends or doesn't recommend each park.
Thanks. While I may be staying on site that day, I doubt I'd use the extra late hours as it's the winter and I'd rather just get everyone to bed early for an early wakeup the next day. Need to get sleep somehow. But we'll see. I'm going to try and get creative with my park hopping this trip.I'd say that at a 3, you're not facing crazy crowds and can't make too big of a mistake even if you guess "wrong".
You have a good reason for wanting to do MK on your day. If you'll also actually USE the evening hours, or have hoppers that can give you an escape hatch if needed, it's still a good choice for you. I think Josh primarily warns against an EMH park if you're not using the time. Then, you fight the potentially higher crowds without getting any benefit.