Your questions are fair, but I only have a few moments this morning so I'll partially answer them.
1. No, I don't believe "hitability" is in the dictionary, but I didn't search very long before confirming one way or another.
2. Just the tenor of this book's threads flow differently from others. I look at the Finch threads, and they're highly negative, but they seem to go deeper in analysis that these threads do. Just the level and degree of analysis seems deeper. Further, the discussions move along to new, pertinent points more smoothly. IMO, of course.
More on this later, if necessary.