Yeah, you’re right that there are other solutions out there, no doubt. And if people are concerned about missing out when a war and/or a titan ends, they can even just set an alarm clock on their phone as well. So theres already existing solutions to this for those who really want to make sure to not miss out on war and/or titans, indeed.
I’m mostly thinking of having it as a “quality of life” feature, maybe aimed a bit more towards the “casual player” (for the lack of a better description). Functioning in the same way how the game gives you notification when someone has attacked your base, and when a new titan appears (and when titan loot is ready for collecting). The game technically doesnt have to do push those notification, but it does it to notify the player when certain things happen, so why not a notification when war and titans are about to end? And if someone doesnt want the extra notification, they could simply turn it off, and it would be a good solution for anyone