Err you know they match the video to the audio delay on modern smart phone apps right? The only time you actually experience latency is when you attempt to pause/play the media, or you’re trying to do something in real time (like record with people around you). If you use airpods and an iphone or something the video will not be out of sync with the audio.

You can literally even see the video lag when you hit play as it ensures it syncs with the audio.