Why captions belong in your presentation toolkit
Presentations are usually the thinnest planned-vs-actual margin in any meeting agenda. The presenter has a deck and a goal; the audience has phones, distractions, and varying audio quality. Captions narrow that gap. They give the audience a second channel that's redundant with the audio — so when the audio loses them, the captions catch them.
This is true regardless of audience size. A 6-person quarterly board meeting has the same issue as a 6,000-person product launch: every audience member misses about ten percent of what's said, and the missed parts are random. Captions reduce that miss rate to near zero, which is why teams that try them once tend to keep them on for everything afterwards.