If I had to mash the A button through something, that would be completely different.
This is in game audio feedback.
This goes into the same position of my brain that "return to your positions" did in MGS1. Maybe it's different for others. Maybe it's intolerable now. Fair enough, but my old gamer brain glazed right over it.
Maybe I don't remember MGS1 perfectly, but Alert and Caution radio dialogs in MGS games often have variations, changes in the speaking party, and often change entirely depending on location and/or how the alert was caused. There are alert call dialogs for some pretty obscure situations in MGS 2, 3 and 4.
This is the same lengthy line, from the same character, no matter the situation, and you can easily hear it a half dozen times over a single mission.
"Boss, get down. That's an enemy gunship. Stay low and crawl along the ground. That should enable you to sneak past enemies."
That's an extremely long line to hear over and over and over again, every single time a helicopter comes into play.
Sometimes Ocelot will say the line, a minute will go by, and a different helicopter will come in, prompting him to say the exact same thing again.
Plus, it insults the player by making it seem like they're playing a Metal Gear game but have to be constantly reminded the very basics of stealth.
Even more on that same path, it insults the hell out of Big Boss, as though he's some toddler with a short-term memory issue that needs to be carefully steered through a warzone.
And from the "in game audio feedback" angle, it even overrides you own choice of in-game soundtrack if you're listening to music on the iDroid, so you can have played the game for hundreds of hours, decide to replay a mission and listen to your favorite tune, only for Ocelot to turn your goddamn music off to tell you what a helicopter is for literally the 300th time.