This is probably going to sound idiotic to some, and be written off as potentially injury causing by others, but...
Are we reaching a point where fighters could benefit from direct radio/bluetooth/etc communication with their corners? I'm not sure if youve ever been to a large live event, but it is literally deafening. I'm positive the noise impacts a fighter's ability to hear it's corner and receive instruction/help (would be really cool if a green namer thats fought in a large org can confirm/deny this). I'd venture to guess that being able to hear concise, clear instruction from your coaches would be immensely valuable during the fight. As it stands now, corners have to scream short word phrases over and over just to be heard, and most simply repeat the basics over and over, then give a more detailed coaching between rounds.
Are there even earbuds developed yet that could safely support this type of activity? obviously theyd have to be wireless, incredibly small, and able to withstand trauma - but the benefits would be absolutely mindblowing to a fighter.