Why is the entire margin required to enter into a hedged position?

In Options: At TradeJini, we’ve implemented a system where your hedged leg is processed first, followed by the main legs. This helps prevent order rejections due to margin issues.

But in Futures:

For futures trading, the full margin is necessary to enter a position because brokers lack control. The execution order depends on the exchange, and if the main leg executes first, your order could be rejected due to insufficient margin. To ensure smooth order execution, it’s advisable to have enough margin or funds readily available in the market.