Reports will generally display the current balance of a bank account in the currency that the bank account uses.
Your financial position is represented by the amount of money you have in a certain currency, in a certain bank account. Any conversions using exchange rates would be an estimate only.
That said, we are users just like you - and can only speculate as to why a certain feature doesn’t exist in the application yet. Most likely, this one just hasn’t been requested by many users yet / isn’t in high demand.
Edit: You might find this topic interesting: General Ledger Report for multi currency business - it’s the closest thing I can find to what you’re asking for.