Steven

Yes, there are mangas/anime that are categorized as yaoi or yuri. But the thing about that media is that it's only written for gay people (if it's not written as a fetish.) Those shows are good, but the queer relationships are established from the beginning, as does the yaoi/yuri label.

For a shonen manga like My Hero Academia to have a gay relationship, it completely changes how gay people are represented in anime. Mha's intended audience is a variety of people, rather than just queer people. It had a huge number of het boys and girls watching it because the main focus is heroism rather than relationships. THAT'S what makes Bakudeku so important.