What's an extremely high fee? What's high for you may be low for someone else.
that’s true. the transaction fee is proportional to how much you are going to be sending but if you are sending such a huge amount, it might seem like a few dollars might be worth it just to send out that specific transaction. meanwhile if you are only sending relatively a small amount then you might regret that few dollars off for a transaction fee
You can still send a $2 tx if you want and it will go through.
the problem is that it will not go through right away which could cause the problem because it might be a transaction that is needed to be done by the moment this is why many do not use bitcoin for daily transactions for this specific reason