If you have access to one to visit in person, strongly suggest you get tape measure in hand and at least do a demo set up. Assuming that if you're looking at a 30' bunkhouse, it means that there are more than 2 in the family. Agree that the extra kitchen space is nice, but you lose valuable outdoor space.
Our awning is 17'. We lose the space directly in front of the steps at each FAR end, so likely end up with about 14' usable. We routinely have 2 zero gravity + 2 bag chairs and a couple small drink tables. Personal opinion is that the space available on the units you're looking at would have everyone practically on top of each other and no walking space. However.......consider how you camp, the number of people and go from there. It may be very acceptable for you, and yes, the kitchen is very, very nice.
Good luck, happy shopping and happy camping.