Instructors should add subtitles to their videos on BMF.io. It makes things way easier for people—whether they're in a noisy spot, not super fluent, or just like reading along. Plus, it helps folks who are deaf or hard of hearing, which is super important. Subtitles also keep students focused and help them remember stuff better. Yeah, it might take a bit more time to add them, but it's definitely worth it 'cause it makes your course way more accessible and easier to follow. So if you wanna get more people to stick around and actually learn, adding subtitles is a smart move!