You aren't the only one; probably 90% of the audience thinks the same because that must be purely intentional. I'd be strange if this show still intends to tell some grand story like most fantasy, but if it doesn't, then it makes sense as a stylistic choice. It even fits the theme of these people being so weak that they prefer to idle most of their time instead of searching for stronger monster to slay. What doesn't make sense is that they never train. Their lives depends on their skills in battle, yet we don't see them training those skills. The other girl should be shooting arrows like crazy considering she can't hit anything, but instead she's wandering around the town.

The lack of exercise is the only thing I find hard to forgive in this series, as I already accepted the ridiculous initial (or permanent) weakness. Even the ultimate series of a relaxed atmosphere, Aria, is full of nothing but training. The girls are doing it all the time, pretty much whenever they can, even if they still make it look all soft and fluffy (and empty-minded).