It just reduces the power of the democratically elected parliament, and therefor the power of the sovereign.
That's why I oppose balanced budget amendments except in the euro zone. But your guys'es goose was cooked when you gave up your currency.
That's a good point. These amendments must be very carefully designed so that they are as difficult to get around as possible, preferably impossible to manipulate by any accounting techniques.
Pretty much the entire euro project is a right wing project to export German rectitude to everyone else.