It is an ecchi but not because somebody wanted to write an ecchi but because it fits and works perfectly. The goal of this show is not to be an ecchi. Its like somebody just wanted to write a nice romance or comedy or generally something great the way they wanted to and, if they wanted boobs in it nothing was gonna stop them from putting boobs in it they were going to put boobs in it, completely ignoring any restrictions from so called 'genres'. Its like the ecchi scenes do not get treated like ecchi scenes but instead like perfectly normal ones which were perfectly supposed to be there, they are not a third wheel to the story they are the story. The physics error and low probability of happening in real life scenes, basically the entire anime, were sometimes really funny and not forced (i mean if you mean it the physics way they are forced but they don't feel forced and that's the thing, the physics breaking was funny here) and not cringe. Of course the physics and probability of stuff like that happening can be criticised but that's not a valid argument because you wouldn't want to watch a show where nothing is happening. The entire Anime does not feel forced or cringe, that's rare nowadays.
They feel natural and most importantly: They do NOT feel FORCED or CRINGE. The anime does one thing really good: The ecchi scenes do not feel like ecchi scenes. Yes, it may have more boobs in the opening than an entire hentai, but thats not a problem.
