^ if you dislike hetero relationships and only want to watch it for yuri things then definitely don't do that. The show is more than just shipping/romance.
"the story seems to be pushing a het ship or two" what does this even mean? The show isn't even yuri, it's never tagged that way, and before the anime started, very few people ship Fern/Frieren. If you don't like the show, that's fine; but don't talk like the show has done something wrong by having het relationships.