I meant breaking your fast with dates is kinda arbitrary not the fasting itself. Fasting is very much not arbitrary and has a very special meaning since it's one of the few things we do solely for God and God alone. Also you can fast outside of Ramadan as well and get additional blessings from it. The prophet would routinely fast on Mondays for example. I think the only days you are not allowed to fast on is Eid because it's a time for celebration.

There's no rule that says you _have_ to break your fast with dates. We just do because that's how the prophet usually did it. Dates have no inherit religious significance. I eat them throughout the year because they are delicious and have nutritional benefits and there's some baraqah (wisdom) in things turning out this way. Also when it comes to farming dates are often harvested in late fall/early winter that's when they are juiciest so we just missed the window but also Ramadan rotates around the seasons due to being on the Lunar calendar. But there are different kinds of dates and you can dry them and they last on long time without spoiling. A very useful property when you live in a desert hence why it's such a common fruit there.

Even when the prophet didn't have access to dates, he would break it with water or yogurt, or even just salt instead. Whatever he has access to at the time.