What we've become used to
[...] -- 2 thoughts: 1) IS THAT ALL?!! 2) Do not watch Juuden-chan
Author is quite correct in one sense; by the standards of a long-term anime watcher, one who has long since become acclimatized to juvenilia and fanservice, the one bad moment in Sora no Woto is almost nothing. Even if one dislikes crassness, it's easily ignored.
(I myself am one of these jaded people; I have been known to completely forget that certain anime series had some fanservice until I was gently reminded of it by someone who has a 10 year old son and so is sensitized to that sort of thing.)
But I think he's wrong in another sense. By the standards of a normal person, someone who is not a jaded long-term anime watcher, this may well be not such a little thing. And even among people who watch a lot of anime, tastes can differ substantially; to put it one way, there are still plenty of anime to watch if you don't like fanservice.
(Frankly, if you look at fanservice anime with the eyes of an outsider there is a lot that is kind of disgusting about it. Juuden-chan is an especially good extreme example of this in one direction, as is High School DxD in another.)
Or to put it briefly, we've become used to a lot of things that would shock outsiders. I have no particular editorial opinions on whether this is good or bad, but I want to note that it undeniably exists. What is routine for us is not routine for everyone, and we've become comfortable with things that outsiders would find startling and probably at least somewhat disgusting.
I'm conscious of all of this partly because I talk to people who are not jaded long-term anime watchers and even give them anime recommendations from time to time. This gives me a useful filter to look at anime with; I ask myself if I could encourage them to watch a particular series or if I would have to add a bunch of qualifications and cautions.
If you are a jaded anime fan, willing to ignore a moment of crassness, I feel that Sora no Woto is a great series (assuming you like its genre in general). But if you are not, that moment of crassness might ruin the series. And when I wrote my commentary I was conscious of that, especially because the series is something that I really would like to be able to recommend to everyone.