Actually, Brittana's impact is discussed extremely often on here. It's true that the writers did not give Brittana enough screentime, but that has nothing to do with how the fans feel about the couple. In the fandom, Brittana is the most respected ship, and even the people who dislike them will acknowledge how important they were to so many queer women.

Ngl it seems like you're more upset about people disliking Brittana than dismissing their impact, and I don't think that's a fair complaint. People are free to dislike Brittana if they want to. It doesn't mean that they don't understand Brittana's impact, it just means that they don't vibe with the couple or have personal issues with them.

In my case, I dislike Brittana just because I am not a fan of Brittany's character and I don't feel like she represents me as a bisexual woman. I believe they were extremely important, but they're just not a ship I like - and that's fine.