To answer both questions simply: I don't care about fanservice. Female characters in revealing outfits were not drawn for me and I, despite being a woman myself, am not offended by fanservice. I have friends who like it, and I am perfectly fine with it because, well, sex appeal sells (Marilyn Monroe's example is both famous and infamous depending on how you look at her situation). As for fanservice for women, it does seem fairly limited, but admittedly, I cannot help but whistle a little whenever I look at Frederick's summer alt because, well, it's Frederick, my favorite Awakening man, and my does he look good. Then again, my interest in the game does not depend on his abs.
All in all, it does not affect my experience because I play FEH for FE characters, gameplay and stories I personally find interesting. Is it necessary? No, and sometimes it gets ridiculous, it really does, but I don't think worrying about fanservice, of all things, is good for my nerve cells (obviously, I am bothered by loli/shota fanservice in general, for example, but that is a can of worms I am not willing to open). I mean, I do have a figure of Camilla and I am not bothered by her... anything, really. In conclusion, I understand why some people hate it, but I also understand why some people like it.