The subscription box was labeled by age and it hurt Asa's feelings that the things at her level were labeled "for babies 6 - 8 months" or whatever. I can understand being a little annoyed by it, but like you said, if Abbie would enjoy the subscription they should swallow their pride and meet her at her level.
I've always thought it was the other way around re: A and P's acceptance of Abbie's future prospects. I think Priscilla understands the severity of Ab's impairments and that's why she freezes her out and pretends Summer is her real daughter. I think Asa (as someone here said recently) is still secretly waiting for Abbie's savant moment, or at least genuinely expects some drastic improvement. He is her main caregiver, after all, and he knows all (he thinks) and look at all the change she has made in only such and such amount of time (sarcasm).
They both cling to the autism label because it is trendy. I hate to say that, because I know there are people here who genuinely struggle with the effects of autism either with themselves or their children. But it is a buzzword, a popular topic that you will find a multitude of information and opinions about. The topic of IDD is kind of swept under the rug. Kids are mocked, called mean names and thought of as "less than." Autism...the message you often get is that your brain is just wired differently. Also, you have this whole exclusive community to commiserate with. I'm not saying it's a walk in the park, but easier for most people to be upfront about. Maybe it's time they talked about it, though.
I don't really think Isaiah is much more than slightly above average, but they do put a lot of pressure on him to compensate for what they miss out on with Abbie.
Funny story they told in a live once. At the first awards ceremony for You Tube they attended (it might have been the Shorty? Awards but not sure), Isaiah had been excitedly going up to everyone and saying "we're from Fathering Autism!" and someone mistook him and Asa for a gay couple who were co-parenting Abbie. When they called the Maass family up for the award, the presenters were like "come on up, guys!" and were kind of looking at Priscilla like "who is she?" Ha, they obviously thought Isaiah was a lot older than he is, and I guess the name of the channel doesn't really include Priscilla, but it just kind of shows how detached she is when she isn't putting on a show, like dancing around when Abbie matches her colors correctly.