Excellent answers. Something else I have noticed is that some don't want to see TTATT because staying in is for them a form of doing penance. Watchtower and most forms of Christianity teach that humans are born "sinful". Add to that the plethora of do's and don'ts in the Bible. Heck, even thinking could be a sin. (coveting neighbors wife etc.)
Since Jw's are not taught the doctrine of "grace" but instead, "works" there are those who think they must spend their life making up for their sins.
The question becomes how many meetings and hours of FS does it take to atone for each specific sin? The least they could do is provide a chart or something.