It feels a little exaggerated to say headphones are needed to “survive” a train journey, again I've not yet heard any adverts over the tannoy on a train. Lots of announcements, sure, which can be irritating, especially when they are frequent or repetitive. But for many people they can be essential.
We all joke about “See it. Say it. Sorted.”, but how many of us would know the British Transport Police contact details if they had not been repeated so often? Likewise, how many children learn to “mind the gap” because they hear it regularly? These messages may sound obvious or overplayed to some, but repetition is often what makes them stick.
For passengers with autism, visual impairments, extreme anxiety, or other access needs, announcements can provide reassurance that they are on the right train, heading in the right direction, and aware of where they are. For a blind passenger walking through a crowded train to find the buffet, an announcement saying it is closed could save a frustrating and unnecessary journey through the carriages. Ticket validity announcements may also prevent people from accidentally travelling on the wrong service and ending up with a penalty fare.
I recently made a video about next-stop announcements on buses, and several people contacted me afterwards to say that the introduction of those announcements had allowed them to travel independently. For some, that meant being able to ride without a support worker and therefore they could regain a sense of freedom.
Most people can still "survive" a train journey with announcements, even if they find them annoying. After all, trains also have conversations, shouting, crying children, and plenty of other unavoidable noise. You just might find it more to your taste to put on your headphones, then you wouldn't need to get so angry about the announcements.