I travelled yesterday on a CrossCountry train, on the same route as SWR. There were just two announcements given for each stop, manually: "Next stop in about 10 minutes time is X", and "Now approaching X, mind your step down".
No duplicated messages, no reminders about priority seats, advance tickets, "see it say it sorted", and "have a ticket or you will face prosecution". Also whilst being significantly quieter, yet still clearly audible.
It made for such a more relaxing journey. If it's good enough for CrossCountry, it's good enough for SWR. It does feel like there's someone at SWR trying to create a solution for a problem that doesn't exist.