Very Insightful post.
To offer another perspective;
I think this can be individually based on each person's idea of what that title (in this case, Father) means or is based on individual feelings/emotions vs. their mental development or mental abilities or medical diagnosis of anything.
There are people who no longer consider themselves as having a specific title (mother, father, sister, brother, niece, nephew, cousin, etc) if there is a loss of the family member whose existence gave the person the title. I don't believe you have to be anything but neurotypical to feel as though, for example, that you once were, but are no longer a brother if you are a male who lost your only sibling.
Also, I'm not sure how to word this without being offensive, but I'm going to try my very best, because I feel it at least might deserve mentioning (no one else has said it yet though, so I am open to fully accepting that I may be very wrong here)
But, I noticed that some who are attempting to defend or at least give a possible explanation as to different things about the father (lack of emotion, lack of urgency, etc) are suggesting that he may also be on the Autism Spectrum as well. It may be worth considering that just as it is hurtful to point fingers at someone as being possibly guilty of something when LE hasn't named them as a POI, it may also perhaps be offensive to point out reasons you think someone is also on the spectrum when they haven't disclosed any information about their medical history in regards to being anything other than neurotypical.
Again, I'm willing to accept that I may be incorrect, and there are not any WS policies regarding this specifically (to my knowledge anyway) just felt it might be something to think about.....
(If mentioning this has offended someone, so my sincere apologies in advance)